Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfff4dfcf2c2dc7…

MALICIOUS

PDF

74.0 KB Created: 2021-03-26 02:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1e357f3b6ec8a8a7bec7d979fc05368b SHA-1: b909f1d0f233caf4e6aa740175e3720ee14cd3e5 SHA-256: 4cfff4dfcf2c2dc71ec7b53926fa5ad6c3e06efb845749cc73f4ac836a78be00
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and linked URLs indicate a pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pelibifir.ru/wix?keyword=ap+french+study+guide PDF link annotation
    • http://bigops.fun/4191185951212p79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_60210c19a6933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408174/normal_602a7bfaeb622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_5fd13e6096f0f.pdfIn PDF document text
    • http://defi-bet.world/what_is_the_punishment_for_riba_in_islamgc2qq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414515/normal_5ffb67dd47f28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450256/normal_5fedccab1ee00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5fd15f784c93f.pdfIn PDF document text
    • http://istlan.fun/vampire_diaries_quiz_how_much_do_know4nqd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473432/normal_5fe6ddaa2b2d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_605613c316f55.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/lezerawe/99413584596.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/dead_kennedys_plastic_surgery_disasters.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/below_her_mouth_free_online.pdfIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_e5eede94395f4013a34086ddec3cce76.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_b48e69e491944837bd0156c7f7f0541d.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_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 5264 bytes
SHA-256: 04241dde7eb989c4a6644cae9526e71e48428d884fbb01715ab981926efeccf9
font_01_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 11072 bytes
SHA-256: 120bfcb567636b51f76a26a7f1edbb19c792e148e1a7dba2acdc05ec54cbf33a

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