Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c34743bddca43d…

MALICIOUS

PDF

75.3 KB Created: 2021-03-04 19:14:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c90d3131b4b80f64f83961427849f221 SHA-1: 663cb36ed7c5dd3c293b9600e66777401e9867da SHA-256: a8c34743bddca43de45978a3a7e86452972c211fb8da9f7153d8d4bb91e7fc4b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to other PDF files, indicating a link farm or SEO manipulation tactic. Several heuristics, including ClamAV detection and an ML classifier, flagged this file as malicious. The presence of numerous unknown reputation URLs suggests a potential distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/wix?keyword=sony+sa-ct260+manual PDF link annotation
    • http://sodaapp.pro/49980693189nte29.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/4ctrjbq/puxagikezem.pdfIn PDF document text
    • http://heymama.store/3208237373avn0c.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/HhcgcId/papakuvifofopomilel.pdfIn PDF document text
    • http://kamaz-ftc.com/nursing_process_book85xb2.pdfIn PDF document text
    • http://euroshopme.site/kajikatujuvofagad4d94u.pdfIn PDF document text
    • http://ig-support-service.com/banudewilbwq1q.pdfIn PDF document text
    • http://usacreditscore.info/963612685887ljx2.pdfIn PDF document text
    • http://boldly-grow.com/3ds_max_camera_pathoprdy.pdfIn PDF document text
    • http://abwaab.su/infection_control_guidelines_for_residential_aged_carepqybs.pdfIn PDF document text
    • http://affilateapp.online/zovibitakuwenibuewavj.pdfIn PDF document text
    • http://bandalet.club/legendary_water_park_stuntman_run_2019hkpmz.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/015f4e19-e62a-482e-8d38-3b90e2e0827b/fabukutogomuxajoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db524dd8-130d-47c8-99e6-03f3142a560b/4189651400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3620acab-4a63-4c9f-b9a2-092b2eabfe6a/free_english_grammar_worksheets_for_class_2_cbse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb9add5-0662-4fe0-8ef7-aa9ee3584175/meet_and_confer_declaration_california_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f73271-8a6a-4ccb-8631-4debcf04479d/how_to_eat_move_and_be_healthy_2nd_edition.pdfIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_307291af6ba24160b924ffb0fb89ac9c.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_f67ebd93e938482d8539854187b88188.pdf?index=trueIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_b242be5c1e314aa69ace6c640a41d663.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_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 5516 bytes
SHA-256: 5212336516683de0257d54016d7c735ca334c05837b7775232217ebcc024daf9
font_01_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 15244 bytes
SHA-256: 929360215e6bbb693c470d9ea7bd5e064af12ef78b903802947a4751869e6818

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