Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8467cedb4a3206…

MALICIOUS

PDF

65.5 KB Created: 2021-02-24 17:10:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ea6ffb2e0d267bdc0a72a0ad41e9eece SHA-1: 5a30f9fc14ce5ca9c67f49f99b91cca03cfebd15 SHA-256: ac8467cedb4a3206ec42e547b1b6c307ec7301030510567840ab6590f08ffc2b
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to common internet connectivity issues, designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/123?utm_term=why+does+my+mobile+hotspot+say+connected+no+internet PDF link annotation
    • https://vuwarudud.weebly.com/uploads/1/3/5/3/135314702/1d444911d93bf4.pdfIn PDF document text
    • https://kezivujiwot.weebly.com/uploads/1/3/4/3/134329954/tijek_zalofejam_zubupa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370547/normal_5fecb21a38522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387825/normal_5fd300e270630.pdfIn PDF document text
    • https://kozutimisomu.weebly.com/uploads/1/3/5/9/135982974/1938331.pdfIn PDF document text
    • http://samoe-samaya.ru/basidiomycota_fungioamm5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483851/normal_5fffe5924f2e0.pdfIn PDF document text
    • http://rusakova.space/bowikiwemtdo8.pdfIn PDF document text
    • http://dajexori.mypressonline.com/how_to_fix_a_clogged_badger_5_garbage_disposal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376619/normal_603150e0e89d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/vubebasirilusadolato.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/double_discounts_worksheet_answers.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_off0000c3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DD 5568 bytes
SHA-256: edca60c3e0bdc8ff8d994cdfe40b77cec8480f6090d050befe9ff85cb804cff7
font_01_sfnt_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 10096 bytes
SHA-256: 5e8cb76db2a5f184bcb4a08c15ce17c0edf8d57d40747a8b01b2d90909c9b46a

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