Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9f45aff65569e5…

MALICIOUS

PDF

87.5 KB Created: 2021-03-20 07:27:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 50377e0d10fb6f9a4113cb696090e81f SHA-1: 9a3d0515431c2f2bb346b0cfb50edf6aab002f4f SHA-256: cc9f45aff65569e568f99656e309ea5099ae7f65517198e473dc2f5d55018e0f
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external PDF files hosted on disposable domains, likely to generate traffic or distribute further malware. The presence of embedded URLs and the structure suggest an attempt to exploit search engine optimization techniques for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://golowaki.ru/wix?keyword=what+is+the+climate+of+europe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485800/normal_60209b9b64c87.pdfIn PDF document text
    • https://tipipiteker.weebly.com/uploads/1/3/0/7/130775441/tosedadofisulamofufe.pdfIn PDF document text
    • https://vopupina.weebly.com/uploads/1/3/1/0/131070761/nurekokafe.pdfIn PDF document text
    • https://mufixedak.weebly.com/uploads/1/3/4/6/134602267/vogujegapozopi-razefejubiler-bepolibejezet-pawubedese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_5fdbac3b6a52e.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/3536530.pdfIn PDF document text
    • https://zajanitemamivow.weebly.com/uploads/1/3/2/3/132303208/nitiwipazasel_fonimuwol.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/GoiiQQC/punofivuj.pdfIn PDF document text
    • https://cdn.sqhk.co/bogivinon/hez8Tgg/76551552595.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/jbhfhim/wma_music_player_for_android_phones.pdfIn PDF document text
    • https://vifefafu.weebly.com/uploads/1/3/4/8/134876142/wawariwufibapo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469375/normal_60038ce638821.pdfIn PDF document text
    • https://cdn.sqhk.co/fugapaloter/aIhfDgj/40445008669.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/ggErjdH/51802451133.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/pezijafom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454824/normal_5ffca3b972ac4.pdfIn PDF document text
    • https://paxepufa.weebly.com/uploads/1/3/4/6/134640660/7598625.pdfIn PDF document text
    • https://sumewawuvivifos.weebly.com/uploads/1/3/1/3/131380344/bodozevozisodazaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_e1bac57a8a614fbea0b91211d39b8791.pdf?index=trueIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_d30976034db744dcbab012f1672fa00b.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_f7f31f068b194724920d2637ebc53830.pdf?index=trueIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_7e22a66475f34ae4a72e6abeedebcfc9.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_off0001187a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187A 5268 bytes
SHA-256: 2d758790bbb635a967a360c3eea6743a691e93ebee274d92a7485a9ffe70115c
font_01_sfnt_off00012a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A47 11304 bytes
SHA-256: 1b68a673129ea90f8570eca9830015ec46974d61950d1e710f10c53b22e45a14