Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed2d31414224fac…

MALICIOUS

PDF

98.5 KB Created: 2021-02-02 10:14:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4c883f0a1c8f8011e851f69e773b6d23 SHA-1: 2d02cf3f3b6072522c7eca583797bbe4ab2065e7 SHA-256: 6ed2d31414224faccdfd430588aced0d13127c5a3c14b07bb0a79f8ab80b9b35
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/aws?utm_term=lightning+sorc+guide+diablo+2 PDF link annotation
    • https://joripirido.weebly.com/uploads/1/3/0/7/130776040/b2c0400f.pdfIn PDF document text
    • https://fubewewafipox.weebly.com/uploads/1/3/0/8/130874235/dd4b7.pdfIn PDF document text
    • http://piter.store/dimedobisabubedovudm2lzr.pdfIn PDF document text
    • http://dihtyar.online/502277737813muje.pdfIn PDF document text
    • https://vuxuminitemup.weebly.com/uploads/1/3/0/8/130874085/411d3fbd86.pdfIn PDF document text
    • http://jegexovavof.iblogger.org/actitudes_de_un_lider_transformacional.pdfIn PDF document text
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/3313062.pdfIn PDF document text
    • https://xudagemiribu.weebly.com/uploads/1/3/1/3/131378943/bomukuruxonike.pdfIn PDF document text
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/1422760.pdfIn PDF document text
    • http://viwowiziboso.22web.org/32577442778.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vosanaketole.rf.gd/imagenomic_portraiture_2_license_key_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/identity_v_perk_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/adding_exponents_worksheet_kuta.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/99109398495.pdfIn PDF document text
    • http://sosagid.epizy.com/vuzafufonesobojulaguxo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC5 5416 bytes
SHA-256: a9f83f4f2fcbb9e3b9254295ba1797c3f2b1a22c7cbdcc894e65a346c0713724
font_01_sfnt_off0001412c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412C 12436 bytes
SHA-256: 5e5c4cc937dfd6aef72535d8d881c42dc8d1f353c7b7a248ca59a45fd54cc41d
font_02_sfnt_off00016823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16823 16124 bytes
SHA-256: 806f29293147d46006c18234f24f77bc4e4ff663fd7af2d18b8a194e755893c7

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