Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b16abdafc373f12…

MALICIOUS

PDF

71.1 KB Created: 2020-12-28 21:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: aad49e22e884be121e1f4c3f69c14d14 SHA-1: 9dd2b03e8fae736b7925137bd31266302d67f362 SHA-256: 2b16abdafc373f12c37945534ee7eb7375d878e8c4aba0add3430f3b7d3792de
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one prominent URL pointing to 'traffnew.ru', suggesting it's part of a link farm or phishing campaign. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially harmful external sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=capital+gains+tax+switzerland+residents PDF link annotation
    • https://cdn.sqhk.co/koxixoneto/idiiRgf/meteor_shower_august_2019_michigan.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/4hbjfzm/doxivoni.pdfIn PDF document text
    • https://finijuzado.weebly.com/uploads/1/3/4/4/134444754/a618804.pdfIn PDF document text
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/dovotoleletizofirun.pdfIn PDF document text
    • https://besunuvoduzusub.weebly.com/uploads/1/3/4/2/134266379/2505058.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuwemiromi/Eggxjjz/67928595899.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/xoxaneral/circles_geometry_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/68117735312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb63c06a-c5ba-4763-b111-392afc440f65/47949618197.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/chale_aana_ringtone_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/tufedojotatuzoperin.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/free_downloadable_auto_repair_manuals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffdbdf19-d1ab-4a8e-b7fb-58eff93f8af6/1008232916.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_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 5240 bytes
SHA-256: 5a2497ab25cce2f6209dac449dcaaf1aba84b71dd02936f4a652ca6631573896
font_01_sfnt_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 9880 bytes
SHA-256: f2b1ab4d12aab25adc4be88c03094ebb1509b13f1ce5263e8f1987f14b96591d

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