Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0bcf168da358ff…

MALICIOUS

PDF

194.9 KB Created: 2021-04-04 07:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0f82c47dba2d5bbe63311f14f0cbac48 SHA-1: 43ebf06330917e694f6d469bc7335369410cd0ed SHA-256: 7d0bcf168da358ffa89344a6188ba26c4dde60946b113713fd2c4d14bfb948e1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create fake documents for phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://midufefew.ru/award?keyword=after+series+anna+todd+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416319/normal_60202f78321a5.pdfIn PDF document text
    • https://buronoveze.weebly.com/uploads/1/3/0/7/130739674/jufopezijasazodat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477873/normal_6008a00573992.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxifobiro/f5jf29r/47313820679.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505837/normal_6018cbfc2b386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_603541460aa6c.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/tepuvemejukujexoler.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/coupling_of_alkynes.pdfIn PDF document text
    • http://gomededow.22web.org/tejesivosifuwajifebabow.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/64812845432.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/MiaZGia/zowozaf.pdfIn PDF document text
    • https://povobaza.weebly.com/uploads/1/3/4/3/134383372/zivirufepuralik_burad_koponifirekugi.pdfIn PDF document text
    • http://zuxemesemubozo.mywebcommunity.org/x64_assembly_language.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488316/normal_604e8737ea7f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doruxexim.epizy.com/10638337499.pdfIn PDF document text
    • http://jezepanan.rf.gd/how_to_become_a_figure_drawing_model.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_off0002c6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C6A2 4992 bytes
SHA-256: 8c8af8c64d558015342edb99bcac99640422262a99383c07a6081006bffbbe28
font_01_sfnt_off0002d7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D7B2 11028 bytes
SHA-256: 9566bcfabdd37a03eb69fe8f331b675384d2571991dee00cf41daeb55b152215

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