Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff687a66d47e8d3…

MALICIOUS

PDF

73.3 KB Created: 2021-05-06 08:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5405ebd86143c8af600c30032810c3a1 SHA-1: add72b06d481202d7e854f62d4c3236ba1fea477 SHA-256: bff687a66d47e8d32c61b6572a92b98f7f401a6dbbab4040e5260423e1e081a2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xezojetit.ru/strik?utm_term=basic+python+course+free PDF link annotation
    • https://fezuliba.weebly.com/uploads/1/3/6/0/136056139/6934838.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/e66bddb.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/relug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471238/normal_5ff280505af14.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/fePjgNM/11589819726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427811/normal_601f1da5684e7.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/nimoxan-sozufibo.pdfIn PDF document text
    • https://cdn.sqhk.co/derilunadine/soihjfR/mawipizor.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/oblgiyr/parent_approval_seeking.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_e9cb8576b10d43c9ad45fc15abd69703.pdf?index=trueIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_69e04250464b4078aa438589b708acd9.pdf?index=trueIn PDF document text
    • http://nilizepukufiz.epizy.com/10th_new_syllabus_tamil_guide.pdfIn PDF document text
    • http://dogufisojorosef.epizy.com/30262710068.pdfIn PDF document text
    • http://kavolimuteso.epizy.com/final_fantasy_xv_omega_guide.pdfIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_248d98a69d0a43b2ac0f5f178b60a6ed.pdf?index=trueIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_0d8c739159f84b3ba7740972f40ec924.pdf?index=trueIn PDF document text
    • http://suborox.epizy.com/excelsior_college_login.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_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 5224 bytes
SHA-256: b146a76875a5c504777c72766bf7da542bb464eea7c9f26691184bed7cf285fc
font_01_sfnt_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 10964 bytes
SHA-256: ae83e179308992aaeb48e88961c96a623f0d696b2ff69c9648c1b7b538fc1cd3

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