Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3a70f91cd71c87…

MALICIOUS

PDF

86.4 KB Created: 2021-04-05 09:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ec8dbdfb0964a465562c367e320ed60a SHA-1: 7f80085b96feca56cf052542e2b311a380740951 SHA-256: 2d3a70f91cd71c87aa3b44b762bfd345136ab0ecb445e3ab6cc29fcbf57789a1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or SEO manipulation tactic. The embedded URLs and the heuristic findings point towards the document being used to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/strik?utm_term=how+many+pages+is+the+average+fantasy+novel PDF link annotation
    • https://gedofulijul.weebly.com/uploads/1/3/0/7/130775434/fuvafajatadujufonobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477658/normal_5fdb92f99f7aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_604bbf978c979.pdfIn PDF document text
    • http://temppicture.xyz/pre_and_post_testing_in_advertising3vdes.pdfIn PDF document text
    • https://pomitowu.weebly.com/uploads/1/3/4/3/134389192/7c7bec.pdfIn PDF document text
    • http://supportcopyright.net/80925335566gyacn.pdfIn PDF document text
    • http://olymp-trade.top/juruturojixajenznfys.pdfIn PDF document text
    • http://pitushok.fun/what_is_a_rachel_haircutpbtt2.pdfIn PDF document text
    • http://8bitbeardsco.com/mugen_eve_lifebars_downloade052y.pdfIn PDF document text
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/7083275.pdfIn PDF document text
    • https://wadodimimilupe.weebly.com/uploads/1/3/0/8/130873890/jixise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9d81216-ed44-4e1f-bfef-9dee31b95172/netgear_n300_wnr2000v3_repeater_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82f849a-8856-40ac-81d3-68d554e50f65/71684791943.pdfIn PDF document text
    • http://robogotut.epizy.com/68957480067.pdfIn PDF document text
    • http://suvibada.epizy.com/14892439335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd0f302-9ab0-4b1d-a2e4-03114d0d1859/nojibapaparerugum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903214a9-63dd-4eb4-a5ec-48ff4409f2e1/zazuzeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32c150e8-e63f-45f4-99b0-bd1bc4d59ead/rolujiwolonuxo.pdfIn PDF document text
    • http://rowovenali.epizy.com/woguzeguxibuzed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b91255-3c6f-463b-ad8d-f6f2c26a6085/pikixuxonejiwekabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173d6d10-bd8e-4f58-bd13-7b81ce4855f2/definition_of_food_chain_and_food_web_with_example.pdfIn PDF document text
    • http://jafafikano.epizy.com/17555477800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3873e082-fec7-4674-9d82-009f2c0d2600/bifutorokewejasewamomadi.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 5532 bytes
SHA-256: 18e3fc712306b00680e801ed6a743d1e676f71525021c936a6064ad771a7f7fa
font_02_sfnt_off00012694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12694 10836 bytes
SHA-256: a0c432712b1ea88e4172e8fc49377d2a48c7828fdbdeba29b51f81f1e9d60387

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