Malicious PDF — malware analysis report

Static analysis result for SHA-256 2154603ef8a8380b…

MALICIOUS

PDF

86.1 KB Created: 2021-02-28 21:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7340ff6ea9ac152d9a4c27c808ab9847 SHA-1: 7255abc797ba5c8c045322120f8fedc34579f129 SHA-256: 2154603ef8a8380b990670224b3490413ef16dcee12073178e0d0d76a5a96614
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a PDF link farm, with the primary URL pointing to 'fokemale.ru'. This suggests a phishing or SEO manipulation tactic. While no scripts were directly extracted, the PDF structure and the nature of the URLs strongly indicate malicious intent, likely to redirect users to malicious or spam content. The ML classifier and ClamAV detection further support the malicious classification.

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 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.
  • 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://fokemale.ru/strik?utm_term=when+was+the+marlin+336+rc+made PDF link annotation
    • https://mumanewuneju.weebly.com/uploads/1/3/2/7/132712109/kupujukefufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_5fea272e33a85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390323/normal_6022eaa9431e0.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/dixeritifuxunuziwigafefep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446497/normal_60052a6a8acde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_6021d41c7be0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477408/normal_60208e65eabf9.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/ad6f3ed3.pdfIn PDF document text
    • https://girisuwudogepo.weebly.com/uploads/1/3/0/7/130776006/vuguwaxunex_xerejige_xanujikodigaduf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388041/normal_600178884b165.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/mefonevimimix/new_android_phones_2018_under_10000.pdfIn PDF document text
    • http://wegigofasaros.rf.gd/palakipukalewekumurebo.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/45189303375.pdfIn PDF document text
    • http://livodubudo.rf.gd/glioblastoma_multiforme_speech_pathology.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/56274361322.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/rajuninuxufufige.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/33485784378.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_off000110ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 5600 bytes
SHA-256: 7bee5507264db4930067b0675fa3f253ecc86408ec86a958425e06e8eab08f34
font_01_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 11588 bytes
SHA-256: 79af965e7b1840b6ecfbc54ac56381c8a8d05075e911bd7bd614b4f63344ff89

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