Malicious PDF — malware analysis report

Static analysis result for SHA-256 d484c67872e00737…

MALICIOUS

PDF

104.4 KB Created: 2021-03-17 00:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8cc0b5277434135ab3530cd544c16b3e SHA-1: bc1ef1c422cd910a279c5a5e60d12bfd12fd71c6 SHA-256: d484c67872e00737b2f99a9fcffddcfcac06081137df7290b6bdd0178aa92838
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. While no scripts were explicitly extracted, the ClamAV detection and ML classifier suggest malicious content, likely leveraging embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/123?utm_term=platform+technology+topics PDF link annotation
    • http://vugoxipagej.iblogger.org/99476507263.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/13a2fe.pdfIn PDF document text
    • https://jodeliloku.weebly.com/uploads/1/3/5/9/135975589/9067390619e6d.pdfIn PDF document text
    • http://xumukekuvag.22web.org/rigiwomiropubero.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379848/normal_5fcbee125747c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445557/normal_6049c545e6206.pdfIn PDF document text
    • http://lanejaselisipu.22web.org/78159538221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_604e681a7f412.pdfIn PDF document text
    • https://larunigilusevim.weebly.com/uploads/1/3/5/3/135320243/9099548.pdfIn PDF document text
    • https://taxikifa.weebly.com/uploads/1/3/4/4/134496463/dexirikeso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480743/normal_5fe7afead459d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370740/normal_5fec1639c5502.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_ad5c1af417d8489a827e5b2d85c32e58.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b13ec4-a008-43c4-a178-5fdcd571847b/no_game_no_life_zero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b22f188d-088f-4018-bfdf-af390b070720/which_of_the_following_is_true_about_void_and_voidable_contracts_quizlet.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_f5da38083bea4180a4adb4d960192dcd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eea53c7-bba6-4f09-9f3c-3d91e5da18ab/54047776040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/218ec772-031a-43fb-8975-3b20967c906f/machine_learning_interview_questions_amazon.pdfIn PDF document text
    • http://luwemazezabubat.rf.gd/php_auto_format_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae611b25-460e-424f-9896-cf8b31f6926a/bidejajunavorolesagexawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd357a1e-08ea-4c81-9eee-e42235f7aad7/jikasewadefutawinifuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0dae5d-90d9-4a89-be77-a8393e10a56d/twisted_fairy_tales_snow_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/230114c2-f229-4a29-91bf-9a95963a00c2/longman_dictionary_free_download_for_windows_7.pdfIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_d09ae64f4fd249e398c76d1458384db1.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15754 5532 bytes
SHA-256: 492496464b1f612d9f1cba2158d44f1d169bb478cb3218d2316f585bd5caa12e
font_01_sfnt_off00016a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A0B 12412 bytes
SHA-256: ed5fe6918af54c0100ab1fb7e4174557b462b957d615dc64dfbd498c87f7943a