Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cfe68082c2d2d3…

MALICIOUS

PDF

67.0 KB Created: 2020-11-18 08:00:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b668317fdabc12c30907e6771cbfb112 SHA-1: 9c1519458fa7854b93ab70c85cacf976922a9e5d SHA-256: f4cfe68082c2d2d349078e8e960157992ccff98069aab812bbfdd30750615438
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://traffnew.ru/123?utm_term=what+are+the+4+types+of+claims PDF link annotation
    • https://patufefuwo.weebly.com/uploads/1/3/4/3/134312622/gisegikon_gomodopawodu_zomafabururimuv_nijewatigev.pdfIn PDF document text
    • https://welofubevi.weebly.com/uploads/1/3/1/8/131856084/tirezisuzafilix_zebifefor_tasiti_guxotevegomulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f8f0908c9b84.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/linisimiwovane_mewomajudam_nojupogifuvuxef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f87b21a6f54c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382965/normal_5f96b96822ff1.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/rezovovob.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/b628c54eef4e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388820/normal_5f91f059dec1a.pdfIn PDF document text
    • https://kefozonijufan.weebly.com/uploads/1/3/4/6/134689321/tokikodu.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/9124817.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfe5dd94-a887-464e-89e3-4bee7f2191f9/85854703730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b808d8-17d4-4e70-9d55-65911fd931f2/xakamorutus.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_off0000c92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92D 5456 bytes
SHA-256: 6b583daf26e10697315a8f46a2787dc43c670282d4adfe6f552d024a9383075b
font_01_sfnt_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 10504 bytes
SHA-256: 081768730ccf4d7c8adeaef1e9cd360d52b88ac5c0b5a136ba0c72a99d7a6397

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