Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ee93ca2529fd84…

MALICIOUS

PDF

74.6 KB Created: 2021-02-02 02:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8f95ad8ee1d4b4ec2d1efafa53a10c84 SHA-1: bf3c09f3fb2a2e3e4965ba5cba5b298c2ba07f46 SHA-256: b8ee93ca2529fd8499971aba6e268a9f70eca94478c2a5258fdebef60736a4eb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm, suggesting a tactic to manipulate search engine results or redirect users to malicious sites. ClamAV and ML classifiers indicate malicious content, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and external link farm heuristic strongly suggest an intent to redirect users, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/123?utm_term=bioflix+study+sheet+for+dna+replication+answers PDF link annotation
    • https://cdn.sqhk.co/folamudoj/D80gfib/7732924645.pdfIn PDF document text
    • https://cdn.sqhk.co/xilelawemu/iMggjaw/civ_vi_civilopedia_online.pdfIn PDF document text
    • https://cdn.sqhk.co/rukugewul/Jidq5gc/nintendo_switch_online_family_plan_adding_members.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/UyjGbge/51495872465.pdfIn PDF document text
    • http://zaxobus.iblogger.org/airbrush_templates_stencils_skulls_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406169/normal_5fcd609f5fa29.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/eifPhgs/jofuvavodefuvuzilibog.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/kqAhdOp/37106542421.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/je7ggge/cat_warehouse_t_shirts.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/QjjkA6c/road_rash_3d_ps1_high_compress.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/WsjeLaA/gepelasaz.pdfIn PDF document text
    • https://zabuxowinuj.weebly.com/uploads/1/3/4/8/134874463/8343630.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wosazegaguzi.rf.gd/iceberg_lettuce_planting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/89668158047.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 5556 bytes
SHA-256: 16d8e453a2a3527a6ec32cb0f089b604c97327f723ebae9e3aa72f8691ec5dcf
font_01_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 10524 bytes
SHA-256: 63dce67e25b8e634d450534c32324a8f7159180e0355f4444896186cb90e51dc

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