Malicious PDF — malware analysis report

Static analysis result for SHA-256 142aa545cfebd7f9…

MALICIOUS

PDF

77.8 KB Created: 2021-04-30 19:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bf3bef2569bf9156138c37cc58d7c864 SHA-1: 25cb4842d2825b4cd495a9fa45329bba3fe547b4 SHA-256: 142aa545cfebd7f9a827ed01b5a6faaa749a5ed0ae343f29e473377a27a18ae1
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'dugedepap.ru', suggesting it functions as a link farm to distribute further malicious content or phishing pages. The presence of external URIs and the ML classification strongly support its role as a malicious document, likely delivered via spearphishing.

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://dugedepap.ru/strik?utm_term=the+black+company+book+series PDF link annotation
    • https://bawidonawasaz.weebly.com/uploads/1/3/4/3/134354070/a68d03a408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_606c195a2f32c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_601a1bd689300.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481821/normal_6007697032040.pdfIn PDF document text
    • https://nazumuliwoj.weebly.com/uploads/1/3/1/3/131383416/3217399.pdfIn PDF document text
    • http://soteguziropuku.22web.org/dejawitewut.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/mejifavo/free_klondike_solitaire_no_ads.pdfIn PDF document text
    • http://xitixamipew.rf.gd/our_lady_of_the_lake_university_volleyball_division.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/ladagabudolifesikovozovoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3fbb00d-9aac-4cf7-a5df-0b1f09e8f888/will_there_be_a_new_5th_wave_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e105c879-8138-4d91-ab3c-59654c45b0da/87745450865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a6def5e-5b0d-49d1-a301-6ef100daff70/nick_drake_parasite_lyrics_meaning.pdfIn PDF document text
    • http://zapofekeba.rf.gd/catecismo_popular_primera_comunion.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/vukuseliragixem.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_3251ac829bb54a20b29109a3c2d57e73.pdf?index=trueIn PDF document text
    • http://fuvimexapa.rf.gd/kuwusasenusunomexobikenew.pdfIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_648aa3d8ca8345b9abf79c60829746ff.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_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 5428 bytes
SHA-256: 239811ade73bbd5952b80bb16a9bf4757e359e374e640ab2a21a69f1fcb7662f
font_01_sfnt_off000104a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 11100 bytes
SHA-256: b78ad2df9c1c740c7be6ca4fc786b350e37aa9dc2a18090435b84a712059d3b0

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