Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d06f8a94e9f5f86…

MALICIOUS

PDF

64.5 KB Created: 2021-02-02 07:24:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: db0c14153d237a21969f31bea0991bf0 SHA-1: b00c5dbf739edb41b7e97296a14b78b4dfa9fee0 SHA-256: 4d06f8a94e9f5f869b2116296bc4a07d2a633e510749e1288eb5e8808b75cb20
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to potentially malicious content. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/aws?utm_term=digital+literacy+test+answers PDF link annotation
    • http://boomerangoo.site/wafufodobujumire7vr9a.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/hcYMnig/scoop_it_bowl.pdfIn PDF document text
    • http://apparentlyopt.com/year_6_algebra_worksheets_ukpfntn.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/iboid0e/vector_gun_cod_modern_warfare.pdfIn PDF document text
    • http://agent-ritual495.online/72238197849we938.pdfIn PDF document text
    • http://mifvideo.space/regabixodyuqu.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/iudiiVN/xopudi.pdfIn PDF document text
    • https://kenoduzuran.weebly.com/uploads/1/3/5/3/135350653/rezunazavixin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_5ffc0a1859529.pdfIn PDF document text
    • https://jerijumewatopod.weebly.com/uploads/1/3/5/3/135330781/4750185.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/amko3hb/ants_in_carpet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374024/normal_5fcc28c9f18f5.pdfIn PDF document text
    • http://espaceabonnes.com/100088691697f9qt.pdfIn PDF document text
    • http://tramlaweq.online/vurezawatutitimajevpjl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421969/normal_5fe7e5d548cac.pdfIn PDF document text
    • http://raicen.com/36288714324rkm3w.pdfIn PDF document text
    • https://cdn.sqhk.co/lulamekajasu/KgdmhiI/5402435195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_600f92db4cea8.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/9a855fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE9 5160 bytes
SHA-256: d45e60c00cf0730163ff69d730769a0f5963f22a078ac4f0e3dd7cedac414e06
font_01_sfnt_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 10420 bytes
SHA-256: 099ff090a2823563bf9d34fc46505438f0e7bd37ce378d4d4e11bb25713f7ce2

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