Malicious PDF — malware analysis report

Static analysis result for SHA-256 883321e50d38c881…

MALICIOUS

PDF

73.7 KB Created: 2021-06-08 09:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 300ec9b2b5a40f5e8117c676d3080a4f SHA-1: 051cdfc0f31b476eca27fdc8eea9cee8b5b7a2be SHA-256: 883321e50d38c881a652c610ca7fffae6b785645624a9722fc94f541d2b113f2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the PDF as malicious, with a specific detection of 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://garglob.ru/pbw?utm_term=strategic+management+planning+for+domestic+and+global+competition+14th+edition+ebook
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/06f76028a4d.pdf
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/kagag_kuluro.pdf
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/6057c199.pdf
    • https://kuvopesi.weebly.com/uploads/1/3/2/3/132303138/feposefofej.pdf
    • https://jomefexud.weebly.com/uploads/1/3/4/7/134732593/sasefopij-ripegozerugitin-lowuvuzawegurap-xezaveduluba.pdf
    • https://zemejinifuv.weebly.com/uploads/1/3/4/5/134577925/motilawilap-vodatilabe-deweb.pdf
    • https://jomibijavajele.weebly.com/uploads/1/3/1/4/131409275/vatelowuronuxa.pdf
    • https://xasezufud.weebly.com/uploads/1/3/4/0/134016907/semofuvewusi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fatakalewene.pbworks.com/f/jogos_vorazes_1_filme_completo_dublado_online_gratis.pdf
    • https://uploads.strikinglycdn.com/files/49ff0a6d-4cc0-438c-b976-8e733ee0d52d/if_i_perish_esther_ahn_kim_movie.pdf
    • http://xifatarege.pbworks.com/f/how_to_pause_video_recording_on_iphone_11_pro_max.pdf
    • http://poxanoralanu.pbworks.com/w/file/fetch/144569817/19035282561.pdf
    • http://fokopaviwu.pbworks.com/w/file/fetch/144607308/vozobixa.pdf
    • https://uploads.strikinglycdn.com/files/cc3ebfc7-f388-4ea8-9577-986030cfbc3c/wufawodinexaso.pdf
    • http://buxozodevoge.pbworks.com/f/massey_ferguson_135_parts_catalogue.pdf
    • https://uploads.strikinglycdn.com/files/ed973168-f0ed-485f-bb51-f9b1872201b6/yamaha_timberwolf_carb_diagram.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e040.bin
8c2d606290df46561dba72730f08c0fb6cc9122b9651accf71b4bfcfe6f219bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 6016 bytes
font_01_sfnt_off0000f498.bin
27ab37dbdebae75ac53ea6d0c5152fd9b9358c796290f4c7f7e8b24cb7be199f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 10516 bytes

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