Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74bbf54b47ff825…

MALICIOUS

PDF

74.9 KB Created: 2020-12-11 02:47:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: de06da4095edf371fd2b0a9a6bfc1bb8 SHA-1: ea8420b72f2f91c90a210b140b4055d21da48f0c SHA-256: c74bbf54b47ff825d2c3ac32cd674cd1750033cb4e73e0da17cbab404b2a173a
66 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to 'traffnew.ru/aws?utm_term=angielski+czasy+gramatyczne+pdf', suggesting a lure related to English grammar. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, reinforcing the phishing or malicious distribution intent. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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://traffnew.ru/aws?utm_term=angielski+czasy+gramatyczne+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374545/normal_5f9ae42447476.pdfIn PDF document text
    • https://gabofulonu.weebly.com/uploads/1/3/4/7/134730366/d799cf0ca58f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_5fd2a9cf2017e.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/jizuginotu-timuwufixawojer-fajumuxozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5f8ce230af205.pdfIn PDF document text
    • https://suxokigivulumu.weebly.com/uploads/1/3/4/4/134479742/8996222.pdfIn PDF document text
    • https://panebafizi.weebly.com/uploads/1/3/4/3/134365464/5357711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_5fc30e60b90b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478932/normal_5fc3ec21f1d96.pdfIn PDF document text
    • https://bosijoputa.weebly.com/uploads/1/3/4/3/134317673/tewaderabomawugoje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc567426b97992eb579db2d/t/5fd129ec0049c86eab35a8d8/1607543279003/color_island_cabinets.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf647218e72e5fdbcfb972/1606378610513/tewefurededusamubowu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b7932e34347c70431387/t/5fc14050e6d49a06bbbfd73a/1606500434069/togainu_no_chi_guide.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_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 5680 bytes
SHA-256: 0994e2a7927d8306407618eadf003e5d893ea2b0b22ce50528a70c1059618d71
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 11528 bytes
SHA-256: 38e3ecac8d488221d63bdd6813bf8db0f5193d572be3cc5122174e3b480f2b4f

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