Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7cb2d78d0014f0…

MALICIOUS

PDF

75.6 KB Created: 2021-04-19 12:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6b2efce7954eaf1281540654627ea171 SHA-1: e4068b113378ec2d48ebd71f83781248f8741728 SHA-256: bd7cb2d78d0014f0e16b64497923ec340bcf040a1d4eebfc09cc5aaccb0431ef
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable domains or using UTM parameters, indicating a link farm or phishing attempt. The embedded document body text is heavily obfuscated and unreadable, suggesting it may contain malicious JavaScript or other exploits.

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://maypoin.ru/strik?utm_term=flowers+for+algernon+test+common+core PDF link annotation
    • https://cdn.sqhk.co/jasurisunav/kjhNCOd/40949575116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_605f782334f9d.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/tD7Flib/harris_jayaraj_songs_list_masstamilan.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/q0hilib/demolition_derby_2020_ohio.pdfIn PDF document text
    • http://axecheat8.xyz/36302870574ankpa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455377/normal_6011d300008a5.pdfIn PDF document text
    • https://cdn.sqhk.co/xazakamugi/idijzgj/36173839038.pdfIn PDF document text
    • http://lollipopa.online/the_art_of_acting_clearly_rolf_dobelli6xz6v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_5fe83b02ae66c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jagux/whites_goldmaster_gmt_metal_detector.pdfIn PDF document text
    • https://383fd46b-cc41-47b7-9379-19c19d7bb1fe.filesusr.com/ugd/81c43a_60fb82caf8e84166ba6546fd57586cf7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/bikubodagilikakuve.pdfIn PDF document text
    • https://65fca3b3-7ce8-4d56-9bc8-ebe46cc5223b.filesusr.com/ugd/f6ed72_3c448033da534e2c96a88eaa39c822ae.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_6d072a7eb96946e781a5206414a7887a.pdf?index=trueIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_2b6e341f7a8541339267902369762c69.pdf?index=trueIn PDF document text
    • https://c5b3e1fc-3b55-407d-a8d9-2bfa6c9015c1.filesusr.com/ugd/6df244_35a6a51388bf45f1a12256051f783736.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/27987309160.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/dobekurezadotatosonazez.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_5749cba2a3c94b19b1969771213d8676.pdf?index=trueIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_7a7fa074fdf34148b6364e5b4ac444ef.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_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 5248 bytes
SHA-256: 023af9ae4477c99379d083bdba69a5ec6127de35884fc596de8e3c7f148cd358
font_01_sfnt_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 10900 bytes
SHA-256: 8239cc1e4a547ebb6349942a4bac0650fe3eab6730eca61747d1b24bc94e78e8