Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae67b4a8fe37134…

MALICIOUS

PDF

69.3 KB Created: 2021-04-02 17:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5a9c192f287987166ddfb9fa5bde32b2 SHA-1: d44915b6e526fb27e2b0327340543fdbc5b3a485 SHA-256: 6ae67b4a8fe371345fc2f987d083a97cfa202e0e6ca42c31122ec915009ed278
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 large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this. While no scripts were explicitly extracted, the nature of the link farm and the overall detection suggest it may be used to redirect users to phishing sites or download further malicious content.

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://bologen.ru/strik?utm_term=nixon+51-30+chrono+black+sunrise PDF link annotation
    • https://cdn.sqhk.co/zeputefilu/chqhhOJ/carnivores_dinosaur_hunter_hd_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/prjbM6b/kelibono.pdfIn PDF document text
    • https://cdn.sqhk.co/xejarirep/eTUPjeG/goddess_kiss_pilots_pictures.pdfIn PDF document text
    • http://zatuludarapix.iblogger.org/codex_adeptus_astartes.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzaxepigi/Zihx8jj/oxygen_not_included_manual_airlock.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/cja9jcU/meteor_shower_august_2020_pennsylvania.pdfIn PDF document text
    • https://cdn.sqhk.co/jodidone/hfKJEhg/jagadaruwofezixunimofa.pdfIn PDF document text
    • https://cdn.sqhk.co/sitosuduf/etzQb00/bricks_breaker_quest_789.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_60eb4ba084644c8188c35cfb5002920c.pdf?index=trueIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_11a3bb56de814c89a6c878eefc3e4a91.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_d49f6b0c09e442ab84b030a2976296cf.pdf?index=trueIn PDF document text
    • https://539b613c-a54f-4c74-97b0-41cdc0f13365.filesusr.com/ugd/f6e6b4_1d93f07c4c594b488d4670d8b699bfc1.pdf?index=trueIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_0274043e92a2467692453f720c62a8fa.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_8ef8d65232fc4777b393d3faa204f1ad.pdf?index=trueIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_4b885be6aa9343ef9c3526defebe116e.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_bc9b21a4947d4f59a1a7814e1b684848.pdf?index=trueIn PDF document text
    • http://xotesevuves.epizy.com/82174753706.pdfIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_1f0df40e0825400f9fb0c85b070c89b4.pdf?index=trueIn PDF document text
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_2d553304254543fe96078302b5c86ea1.pdf?index=trueIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_f0d58ca1f67b46e69c1280a4630326e4.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_38f79f403c45458984bf3f03c073e70e.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_off0000cdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFE 5644 bytes
SHA-256: 4638c9c242b5ee7f3f1c53d502970441007c2eb4c791542cd6378798b1219562
font_01_sfnt_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 10924 bytes
SHA-256: ef5ff9a817c58d6a060a22a33f0ff5d06da4d7c945403e47a2aa119f58ea0b06

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