Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c54b9c1b2f6764d…

MALICIOUS

PDF

71.0 KB Created: 2021-01-15 19:01:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d22242bc67bb33a5b28f933695210738 SHA-1: 1c81604a2d49ac6a65e63793bb32a1dee86b9cd0 SHA-256: 7c54b9c1b2f6764df022cfb7ca6682c0b9896771bf155357f996599f4ed89837
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains a large number of external links, indicating a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious or SEO-manipulated content.

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 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.
  • 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/123?utm_term=black+bob+wig+costume PDF link annotation
    • https://cdn.sqhk.co/jabakujivim/VgiZhfy/symbiosis_in_cell_evolution.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464072/normal_5fb27f6945352.pdfIn PDF document text
    • https://vejamepune.weebly.com/uploads/1/3/0/7/130776484/vewiwivuxir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5fadf75fd1f26.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/hgicQhj/arena_football_field_measurements.pdfIn PDF document text
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/9085532.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5fecc7fd7d355.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/jjRCijH/hyperspin_arcade_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/ibigMP3/90466611324.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/vuFeGgj/follower_synonym_word.pdfIn PDF document text
    • https://site-1168218.mozfiles.com/files/1168218/78873407176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417983/normal_5fb3cd39bc0c0.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/gotenukevepunin/vufapatibugewimatirolapu.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/79954429715.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_off0000d669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD669 5368 bytes
SHA-256: 082344ea1826946bdc06ef67140416cfaf36383966b866cdba529d0e8e178765
font_01_sfnt_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 11272 bytes
SHA-256: ff33c3e8df5f32476bf45ef3dfe4faae5df8389efd286e49c88a61ca48fe3d7f

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