Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc64fdc9b8fe80cc…

MALICIOUS

PDF

79.6 KB Created: 2021-04-10 05:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4771ecd3390f8ad40e414744cfdb7a78 SHA-1: 7672d839197abd09cdd12ad7e150991f1093923a SHA-256: fc64fdc9b8fe80cca25fa109fffcfb4ed28fbf1dce901a9360b1f6d49509bb1e
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 hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious content.

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://bologen.ru/strik?utm_term=snow+in+midsummer+performance PDF link annotation
    • http://nowtorrentz.com/integrated_chinese_level_1_part_1_textbook_audio64mdq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_6015da1b202dd.pdfIn PDF document text
    • http://segwaywheelchair.ru/tewezenugogusibop53yg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495257/normal_5ffd3c61258d3.pdfIn PDF document text
    • https://judozonax.weebly.com/uploads/1/3/1/4/131454501/1819854.pdfIn PDF document text
    • https://fefujosiniw.weebly.com/uploads/1/3/4/8/134862858/6818115.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/9274214.pdfIn PDF document text
    • https://fukidupedogof.weebly.com/uploads/1/3/2/8/132814182/a5d4a.pdfIn PDF document text
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/nidowobokod-foregos.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/se_ha_perdido_el_pueblo_mexicatl_resumenn9p8i.pdfIn PDF document text
    • https://jososipiwudamuw.weebly.com/uploads/1/3/2/7/132740918/315c0c81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://momubitirukoj.rf.gd/33480923407.pdfIn PDF document text
    • http://vogijub.rf.gd/strategy_map.pdfIn PDF document text
    • http://vesavakiri.epizy.com/the_art_of_taking_action_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7db6095-7435-4acc-9edb-240bcc0e28c4/10113970576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/805e9678-6ed5-46c8-bc11-15a1f55c2ad1/10743896379.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_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 5464 bytes
SHA-256: 817c637f3981d109be5042be6733cc82bfa19841d3768677c1cc6ab38de1f718
font_01_sfnt_off000109a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A8 11316 bytes
SHA-256: 47bb08e203228fb229c7773f91efb01db4a864d5744a237a8c72c9240d3501ce

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