Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b4b16c0150c361…

MALICIOUS

PDF

106.4 KB Created: 2021-05-16 05:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 880d595287b14157998eea76cf06353a SHA-1: bc4532e73c135da1efa62fbbd103a0d37b7ed541 SHA-256: e8b4b16c0150c361c84c82b9b9e8cb76f4db09a1e05996d4f3eb9cc76546940e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/strik?utm_term=what+did+queen+mab+do PDF link annotation
    • http://zuzutogutid.22web.org/metal_forming_process_nptel.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/jewobojupatok.pdfIn PDF document text
    • http://majusenise.sportsontheweb.net/wordly_wise_3000_book_6_third_edition_answer_key.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/xoziloxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/bayesian_survival_analysis_ibrahim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdb0486-1def-4c1f-a2c9-c41f649370ad/figomoteteju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab0134b-d6f4-4702-9b05-2b0dfd413791/chrono_trigger_ds_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df92651d-df09-474e-a4cc-3b59e8f0e0b1/mipujarinoropolilema.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_7f8c0f37ed84411bb0a295fea97ebed5.pdf?index=trueIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_3dd63a579c5149b699a4f318db596626.pdf?index=trueIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_787a08f305eb49fd9b43393729aa9496.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db667138-980d-46b9-8aed-d1b566563ec7/tajweed_rules_in_urdu_and_english.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_a40212d697394d369fca1adeaaea9417.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_12d59fca97cd47a38819fa0c32602255.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc94dc3-8195-4503-b8f9-bcf90481eca5/will_portland_oregon_get_snow_this_winter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b65bc4-61b5-4276-b51e-92861a17ea00/47332260653.pdfIn PDF document text
    • http://deniwejatugege.epizy.com/carte_gaspsie.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_dbe49f01f7834364adc356d4865e3e9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5a011d-b25c-4248-acdd-e532da6f8ee2/things_to_say_in_a_class_president_speech.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0001702c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1702C 18176 bytes
SHA-256: 36bf4bca2dbe62ed7eea770f09dcbd942e9f30cdfd175f8627c1a83adfc01dda
font_00_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 5684 bytes
SHA-256: e0f0922da2f1b5a441c0ab47f148b203928c2bc4519f23812ab58bc0699b7f5d
font_01_sfnt_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 5040 bytes
SHA-256: e98e4f47948d6fba79b4f105d42d56b4aca8dfc6d16b064fb417c44b06c7669e
font_02_sfnt_off00011169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 2656 bytes
SHA-256: dbaab8dcf32bfe64cb008f34eb54f5316f62236e8dffe3de49b44225404383a5
font_03_sfnt_off00011c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 2328 bytes
SHA-256: c42118b51b061dffbc196cd4866a2cf76d9f31ae9d0a8f6c06e6ad224a677b24
font_04_sfnt_off00012722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 2108 bytes
SHA-256: 806d12f4c18e044784d20764d58024893796e88f204c306662924b3e907cbcac
font_05_sfnt_off000130ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130ED 6640 bytes
SHA-256: 2da83060ad210a9a1743b04a22b2cc5ebb14ba7af64fbaa5f25da2d26a1b3d84
font_06_sfnt_off0001428b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428B 15120 bytes
SHA-256: 3c62b238201085eaef76ba920a8caf200dc54cd5360dcc0eabdf954b5118793b
font_08_sfnt_off00018cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CF8 3276 bytes
SHA-256: c6f56f051084033b0538cdf61e3e457d22b7f2c2ea46d10ec59ebb2b81e63971

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