Malicious PDF — malware analysis report

Static analysis result for SHA-256 39abc4276bce8632…

MALICIOUS

PDF

74.2 KB Created: 2021-01-14 21:56:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d5456801607c80c84cd7806ab612bad7 SHA-1: e85a0c321961cab0adebbd18512e72683f838048 SHA-256: 39abc4276bce86328839b3562d36a479d8ceddbc2a9086db321117ecadfc9214
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and trojan payload. The document contains numerous external links, many of which are part of a link farm hosted on disposable domains, and one specific URL points to a 'protonvpn crack pc' lure. The presence of a download button heuristic further supports the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/123?utm_term=protonvpn+crack+pc PDF link annotation
    • https://site-1175083.mozfiles.com/files/1175083/medamanomuzedegaxivan.pdfIn PDF document text
    • https://lotogifivetizub.weebly.com/uploads/1/3/4/3/134309957/9381c60787ff.pdfIn PDF document text
    • https://pixumoxijabana.weebly.com/uploads/1/3/4/7/134748481/givusu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420599/normal_5ffa1b7f1c443.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456376/normal_5feecdfe31948.pdfIn PDF document text
    • https://site-1173833.mozfiles.com/files/1173833/maxisys_elite_price.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxugaveg/ehjcqnS/jisopagiwo.pdfIn PDF document text
    • https://nasotatuji.weebly.com/uploads/1/3/4/3/134392375/tupatikamo_fewegem.pdfIn PDF document text
    • https://foziletixe.weebly.com/uploads/1/3/4/8/134868526/nusepezafukokes.pdfIn PDF document text
    • https://site-1173589.mozfiles.com/files/1173589/brothers_in_arms_3_cheats_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506159/normal_5fb593e90d83b.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/hgUTgdD/97884600512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456121/normal_5fa2564773981.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 4844 bytes
SHA-256: 91cb9473ed26796572d95305d7f47144709b7cdb6dda8c29bc2281908f9dd92f
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 10624 bytes
SHA-256: a55704782a5ebb864e22462da3efa2869677d97889fcc4099f685f1a6f279768

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