Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5b6a7702cac50e…

MALICIOUS

PDF

69.6 KB Created: 2021-02-08 04:23:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0c66a247aac0205aad1c84d3d30ef92c SHA-1: 2890165ae96835a0c275fbf3f8e5789df938e8a9 SHA-256: 4f5b6a7702cac50ea2d8b44e79b44b4765a8c7637d18d67917464a18083aec8d
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous embedded URLs, including one pointing to a domain known for hosting malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme.

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://crophysi.ru/123?utm_term=list+of+roman+triumphal+arches PDF link annotation
    • https://cdn.sqhk.co/kawonidoza/X2yjbic/klwp_live_wallpaper_maker_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/artJeih/9669634266.pdfIn PDF document text
    • http://bigswinner.space/present_perfect_tense_exercisecfuqe.pdfIn PDF document text
    • https://cdn.sqhk.co/nasonamav/djajgUr/nomapixowejeve.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/gL4jchf/gubobinugupobapuvapofovem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuwoguki.epizy.com/34422083166.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/26061693903.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/mesomorph_training_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/badujevesu.pdfIn PDF document text
    • http://rakoduwe.epizy.com/6873141514.pdfIn PDF document text
    • http://kixavukuwowaz.rf.gd/kuzutogufafefufexosomugav.pdfIn PDF document text
    • http://nawonuzegajosi.epizy.com/disixifemekoxuxozeke.pdfIn PDF document text
    • http://wekidezeze.epizy.com/sparkle_background_images_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 5196 bytes
SHA-256: e39303f7d1ce51f4f68fd763d58fc16ebe1d7fdb042472f876f45b3dded19f1f
font_01_sfnt_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 11584 bytes
SHA-256: 308dafc578fc8d902ac46e9dfa6390afc1646a210b1924ef4a567bf6a78f93fc

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