Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57a22334187b1f7…

MALICIOUS

PDF

65.9 KB Created: 2020-11-25 16:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d1acfbeec07a0c590e1e3207284e2090 SHA-1: 6156c0854a1284b6923f72fd945c2007f27fa80f SHA-256: a57a22334187b1f7e9fd7c8845dfa81a2de747025a249a79ff6517b460aebe3e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous external URLs and the PDF structure itself are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafffe.ru/strik?utm_term=edward+scissorhands+hands+drawing PDF link annotation
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/70f1312186e.pdfIn PDF document text
    • https://miwavexirafixi.weebly.com/uploads/1/3/4/4/134495851/porulawobebos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_5f9d3609bb5ed.pdfIn PDF document text
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/c86aa.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/volojopotevo-misapoxovalina-zanuxiri.pdfIn PDF document text
    • https://bitoxusimafitaj.weebly.com/uploads/1/3/4/3/134311342/b00cf5d6c.pdfIn PDF document text
    • https://dadajiwo.weebly.com/uploads/1/3/4/8/134881642/7339112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_5f9d6589a15fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379035/normal_5f8f920d645d0.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/petubapizo/database_system_concepts_6th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/yuzuriha_unist_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/minecraft_1.5.2_unblocked_games_66_77_99.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_off0000c513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC513 5220 bytes
SHA-256: c1a63c63f94f19b3a43c9e37be09cfcf064392780ba9b72b50dbfdb04dc7a785
font_01_sfnt_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 11056 bytes
SHA-256: 105d1727c4e8ef14c5fbcb65a415a71c45d90dfd4b2a595b1018d024dc9f0554

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