Malicious PDF — malware analysis report

Static analysis result for SHA-256 55208a840262e422…

MALICIOUS

PDF

64.6 KB Created: 2021-01-16 12:26:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d56f98a403ca0f4cff88a1ca555143d5 SHA-1: d20e23d17ae3fb004473ea4f9fdd8cd6328f4524 SHA-256: 55208a840262e422bafe9790aa01f968e2f04a071d0c3ae6fe70eb268eeb83bc
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 or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely initiated via 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://traffset.ru/aws?utm_term=present+continuous+negative+worksheet PDF link annotation
    • https://site-1166653.mozfiles.com/files/1166653/pen_paper_strength_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f8b39acd7fc1.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/iiBlbo1/67581429595.pdfIn PDF document text
    • https://site-1179363.mozfiles.com/files/1179363/video_editor_offline_apk_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/1vhgidt/1608665493.pdfIn PDF document text
    • https://vipapesad.weebly.com/uploads/1/3/4/3/134369303/taxonajunazoti.pdfIn PDF document text
    • https://givexikiduxa.weebly.com/uploads/1/3/1/3/131398224/bd2edee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443608/normal_5fadfda04332c.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/2701062.pdfIn PDF document text
    • https://sobopagugakevul.weebly.com/uploads/1/3/4/8/134881985/wewetozafasuwix.pdfIn PDF document text
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/gabuvavimo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392864/normal_5ffe72bba5c4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487419/normal_5fe5757010c45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_5f8fb3a21990b.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/luropiw/dokesajatozokitirilewuga.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_off0000c1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EB 5244 bytes
SHA-256: c9e0222a3187a696bfca967526fa2ed8438a1244fa8594553f7916d8ffffda87
font_01_sfnt_off0000d3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D3 9912 bytes
SHA-256: a2f8b442c81df6d4ee76d3fb8955dcec7c828c472e4465b470a6415ebb342e73

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