Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc97e6ba149b4a6…

MALICIOUS

PDF

102.0 KB Created: 2021-03-02 22:30:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6b95a22a5fe4010845f3c773108c8173 SHA-1: 307f93474f5c6d661d310608fe24151cb3a4bc01 SHA-256: 0fc97e6ba149b4a662ec5a92067208bb81ca5080bc8713d75be6c3cec77e4b9b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/strik?utm_term=why+is+online+school+hated PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378846/normal_600abf5bd2106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428039/normal_60271628ba914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_603d1506e8bdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408461/normal_6001048a7d123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_5fd8cf7c01ad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487413/normal_600d4e66e9a45.pdfIn PDF document text
    • http://pasendapp.online/taxeg15hzm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446036/normal_6007d1e3315cf.pdfIn PDF document text
    • https://lofusomibebez.weebly.com/uploads/1/3/2/7/132740423/kodudekavimufovexa.pdfIn PDF document text
    • http://bigakeka.iblogger.org/duvesi.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/xufaxoferugod/30594017346.pdfIn PDF document text
    • http://pomigipasa.epizy.com/wekekaxabonarevefuf.pdfIn PDF document text
    • http://varoxekoduv.epizy.com/behmor_1600_plus_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/project_deliverables_checklist_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/how_to_add_mp4_files_to_wix.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_off000153b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B7 5044 bytes
SHA-256: a0ccb442fc18892f8466b177e4a8297461caecd7700daaf5926ac13e8b8fdcb0
font_01_sfnt_off000164f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F5 11068 bytes
SHA-256: c8d27b0387328679484f16d215639345f418d63c41d0c0473861a688a99095f2

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