Malicious PDF — malware analysis report

Static analysis result for SHA-256 61192f27e09ed551…

MALICIOUS

PDF

67.2 KB Created: 2020-11-10 07:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 38b36ee740a87accd3747351bf39fa79 SHA-1: 52a8d69a0bbaa6bf5001bf43754f3335018879c8 SHA-256: 61192f27e09ed551c03c2e63b60a8862685d1ba6031b7642d4c175aedf0f679a
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting services, indicating it functions as a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, likely intended to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?keyword=habitica+how+to+change+class In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_5fa2b31943116.pdfIn PDF document text
    • https://xabisemegebo.weebly.com/uploads/1/3/4/4/134491474/wetadukimekim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_5f8e1cb0ec50f.pdfIn PDF document text
    • https://biwewijusegi.weebly.com/uploads/1/3/4/5/134586848/3051500.pdfIn PDF document text
    • https://laguvibokabab.weebly.com/uploads/1/3/4/3/134383318/nikejefipul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446395/normal_5f9ea30fe64d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_5fa8633f0877c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460057/normal_5fa633649e004.pdfIn PDF document text
    • https://ruzasamevu.weebly.com/uploads/1/3/4/5/134591323/wigot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_5f9acedd0a4a2.pdfIn PDF document text
    • https://zupuxugemewizo.weebly.com/uploads/1/3/4/3/134309945/7917d4f0.pdfIn PDF document text
    • https://luvinazomefad.weebly.com/uploads/1/3/4/3/134308035/8218210.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mipizaju/27835262471.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_off0000c87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87B 5160 bytes
SHA-256: e723b85005aa177c33e5518300d8e14c29bbed45069261ee1f40846aa37da19e
font_01_sfnt_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 11248 bytes
SHA-256: a41e64ca629c5cd654aa8ec9a1f46eb5f0b70b1e46ffb87aef8ea1b1d9b0d02b

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