Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4af73f97893ca1…

MALICIOUS

PDF

68.2 KB Created: 2021-02-21 22:39:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 082856dc781b002b2558019cab5a4dbf SHA-1: ce1a85a3c514ffea40caa28c267f5dce1589eb63 SHA-256: 5f4af73f97893ca1afa89410760c484e39582b107ab2ef62acadf75756afb7f2
186 Risk Score

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://jottigo.ru/123?utm_term=used+kerosene+heaters+for+sale+near+me PDF link annotation
    • https://cdn.sqhk.co/kejaxedusuk/fjiAhbo/juwabodojolidupokuj.pdfIn PDF document text
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/19b1d439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fd8260553f25.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/biejcCo/hide_speakers_behind_wall.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_602df8e132eb2.pdfIn PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/kokilevasa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475577/normal_5fe3730e39b6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404490/normal_5fe4fdbb8a487.pdfIn PDF document text
    • https://cdn.sqhk.co/zunowexafa/PhchifV/10462765019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393188/normal_5fdc98b6b14d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419441/normal_6029816114617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459467/normal_600f74b241e84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lotarikavim.rf.gd/53806123891.pdfIn PDF document text
    • http://lufusemeg.epizy.com/3304690605.pdfIn PDF document text
    • http://novotufimaxanu.epizy.com/masaru.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_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 5200 bytes
SHA-256: 747f3a86ea38502313723221cd9a8df858fffc42616e4cdd75ae3a886ff70e86
font_01_sfnt_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 10840 bytes
SHA-256: f0807f740dc95b959dddff32b7d9fc99cb2ee6fe1d561ef40f9cbbcb02fbeace