Malicious PDF — malware analysis report

Static analysis result for SHA-256 f372111e9982341c…

MALICIOUS

PDF

75.4 KB Created: 2021-02-19 13:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 64e4cc7e44c6881e2a02796a394a74c9 SHA-1: 76c273672d277e455310ed3ee84058df6a6f2abe SHA-256: f372111e9982341ce97af9bdeb9d60a395b1987893d48b24899c54c0d200c0c3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=who+is+faith+in+a+simple+favor PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443357/normal_5ffdae951348c.pdfIn PDF document text
    • http://zogagutezuwe.22web.org/sevosojawodip.pdfIn PDF document text
    • https://detabifaf.weebly.com/uploads/1/3/1/4/131436978/326962.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/dL0EjhH/laxalatesuwafiwel.pdfIn PDF document text
    • https://fililajivivumir.weebly.com/uploads/1/3/4/4/134456316/tadokolu.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/jabntkY/pixel_art_candy_color_by_number_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468289/normal_5fd1f9d5edf5e.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/8fe3b7a8e753d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410722/normal_601339f472ffb.pdfIn PDF document text
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/nasatubesi-kakabeta.pdfIn PDF document text
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/makumabe-weferigi-tokadobok-watowetimutomop.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/ihcjgie/odd_man_out_book_ronnie_biggs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viwukekev.rf.gd/gaminuvijakitoxozirosij.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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 5212 bytes
SHA-256: eccbee35c4639b170f98fbf9a65f3d878460e645aeca80a2375f4d2fa33e7ca4
font_01_sfnt_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 11504 bytes
SHA-256: 30808406aef41590a2a54491d0500f0a82c18550201fedb210147ffec4a8dbad

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