Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10fb6c92ad982f0…

MALICIOUS

PDF

137.7 KB Created: 2021-03-13 18:39:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 91fc2e20e5aa141493ea746f70806f06 SHA-1: b286b1b93bdebf3c0dbc49b0d7772f6805326cad SHA-256: e10fb6c92ad982f0f1a517fd5fbf6e66c6d1adc949a4bc4bf8c502825eb6c305
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to disposable hosting and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be junk data, reinforcing the idea that the primary function is to redirect users to external malicious sites.

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://kuzutuzo.ru/wix?keyword=queen+grimhilde+hair PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404757/normal_5fe5445f0e3a2.pdfIn PDF document text
    • https://dilaxizinis.weebly.com/uploads/1/3/5/9/135973905/f8c4c3c793b90fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_6013e154a176e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_60344ac844fe9.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/c93827e0b76.pdfIn PDF document text
    • http://euroshopme.site/48785735669nk1vc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501360/normal_5fcad84a82f91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383798/normal_60313c0c1b033.pdfIn PDF document text
    • http://copyright-helps-team.com/kijirizefakauzvkm.pdfIn PDF document text
    • http://votubuv.22web.org/lisepewexebinewajivuf.pdfIn PDF document text
    • http://idealica-itufficiale.website/xubamojujiupyep.pdfIn PDF document text
    • https://wumotobabupe.weebly.com/uploads/1/3/0/7/130775865/tuzaxuma_zuneraxini_lesirow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wafibajew.epizy.com/gusasekiwewuxorifaroves.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/alzheimer_scielo.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/puwomejevuzevazos.pdfIn PDF document text
    • http://ladisopezaxak.epizy.com/70036140862.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/infantile_hemangiomas_guidelines.pdfIn PDF document text
    • http://jokiperone.epizy.com/bukurafizu.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/6801319799.pdfIn PDF document text
    • http://benepuru.epizy.com/97631541127.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_off0001dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFF9 5120 bytes
SHA-256: a46f04b4a4d7f5b0a7a912523cf9db82cc39ab0401d0dec934d257d5547894bb
font_01_sfnt_off0001f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F136 12016 bytes
SHA-256: ba94237eac1cfe507c2a4fdf425eec64d30c3c2a3bc0a1dc9565e25de4ec43e8

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