Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a130cfecadd20f4…

MALICIOUS

PDF

75.0 KB Created: 2021-03-10 11:04:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0627f0af7e5c19a6745d36c3c14c3cad SHA-1: 9dae048d0a3f07f5857da638a4a1d61d74d4c835 SHA-256: 6a130cfecadd20f4610b28512e269a8860f4712f9a021a44ef654fb81553ac50
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, including one pointing to 'vilenefex.ru/strik', which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=where+is+the+best+place+to+donate+used+toys PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385869/normal_60080a0d5ad94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_603f9ba07e13e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_603bdc3ff3f5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471085/normal_60244fdc6ba5f.pdfIn PDF document text
    • https://cdn.sqhk.co/gobumavurob/EijVo44/dunumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494160/normal_5fd319d3cbb48.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/cjevKhd/lexuxopul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443610/normal_5ff4056fc4df1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369343/normal_5fdd9f022f809.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/ifhe9gi/upper_deck_mvp_hockey_cards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481166/normal_5ff64a287d3c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_6045c5ff1f8b7.pdfIn PDF document text
    • http://negeduji.66ghz.com/66765297592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482619/normal_5ff264564e848.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/blR9ieP/wonixalimabukunaxileworow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479213/normal_5fe5cf7947438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393624/normal_6025c0aa7bd60.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/one_less_bell_to_answer_barbra_streisand.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duguteterexu.epizy.com/dazafuwaxa.pdfIn PDF document text
    • http://bujisovi.epizy.com/fenavelilatujavav.pdfIn PDF document text
    • http://lobulowigewimu.epizy.com/lilegojarixegefomagaloje.pdfIn PDF document text
    • http://vunatilun.epizy.com/wonemixubobop.pdfIn PDF document text
    • http://zagusax.rf.gd/the_metamorphosis_by_franz_kafka_summary.pdfIn PDF document text
    • http://tefinavi.epizy.com/48658460775.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_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 5416 bytes
SHA-256: 4991623b10b602d8474ad692bc6b8658a07afdd726557f32793c24c0b8074358
font_01_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 10464 bytes
SHA-256: 71b1600d7c839ad365e356c960926ce986e8a7bab0e0b4e6e333c34d9574a32c

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