Malicious PDF — malware analysis report

Static analysis result for SHA-256 853c91874c7afb5b…

MALICIOUS

PDF

95.4 KB Created: 2021-01-02 19:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fe6471bf6e493e9a4687b9a4646271e5 SHA-1: 73ccca1615bc9d83d22d25406927cfab43c1a4e9 SHA-256: 853c91874c7afb5b5451bcea6584dca4bd47b16805aced06169a6d8ca3c56e47
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external PDF files hosted on various domains. One critical heuristic indicates a link to known malicious redirector infrastructure, suggesting the intent is to lead users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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?utm_term=how+to+download+smash+4+mods In PDF document text
    • https://static.s123-cdn-static.com/uploads/4383444/normal_5fdef01a289d1.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/NhhWria/roraxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402711/normal_5f9efa729d09f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444630/normal_5fa55232d18a3.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/gfnhdhb/islands_in_the_stream_movie_tommy_lee_jones.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fd07cf3be785.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407085/normal_5fe200ed63cdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446015/normal_5fe46901d91ec.pdfIn PDF document text
    • https://nudametuwino.weebly.com/uploads/1/3/3/9/133997501/dokaxizelazexu_wubodufumot_ronexinidejiz.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/jf2bBhg/kohler_toilet_runs_randomly.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/jgNgeii/dragon_village_with_cheat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 5112 bytes
SHA-256: 3bf0542088eb8952ca4bb6e2eacd86cfca05650c1a6e5944ba1820293f211305
font_01_sfnt_off00013444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13444 11228 bytes
SHA-256: a8e854ce5b1ed92cca0f3968c540314be2542304ebb4d7d15c91e96760fe984e
font_02_sfnt_off00015ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADE 16332 bytes
SHA-256: 91c92fab729f552433758475f1ecf6a366c66c74ae6b4dd9e31a9a0100f2b42c

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