Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f34649365aac09…

MALICIOUS

PDF

74.7 KB Created: 2021-03-11 11:34:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ff44ab24e1898dfbd5276410a97919f3 SHA-1: eede59393883353b48c6e3c3a1869a97cac41ef5 SHA-256: a1f34649365aac099eaa1506ae68c31147fbe8912c7a9187d23725c6f958aa50
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to facilitate initial access via spearphishing, leading users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/award?keyword=anopheles+albimanus+pdf PDF link annotation
    • http://rowewuxeg.getenjoyment.net/search_a_shortcut.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/panasonic_viera_television.pdfIn PDF document text
    • http://trickyturkey.com/happy_sunday_images_in_tamil5rehh.pdfIn PDF document text
    • http://geponimodenebev.22web.org/toefl_paper_based_test_practice.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379626/normal_5ff0602476e02.pdfIn PDF document text
    • http://lajenasuwo.iblogger.org/jodugafugopisegexa.pdfIn PDF document text
    • http://kiwedoro.66ghz.com/boombah_baseball_uniform_builder.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/45101806405.pdfIn PDF document text
    • http://trysol.xyz/467045484150bsmm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401546/normal_6047277e6417d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369926/normal_604913548ccfe.pdfIn PDF document text
    • http://wosidigelime.iblogger.org/xabozerijanoganalesofijez.pdfIn PDF document text
    • http://kamini33.ru/321080329259n308.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_8834854fae86491b8d6423c931b504ad.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_1fa575797e9544b9a9640faec8c8801c.pdf?index=trueIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_7eaae7bcbfbc4dfbb94aab3cf11b51eb.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_973d07dccf2a44168f6d4be261c06d78.pdf?index=trueIn PDF document text
    • http://sukidagijonola.rf.gd/67562034135.pdfIn PDF document text
    • http://zarufutebere.epizy.com/nodax.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/45972007292.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_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 5312 bytes
SHA-256: 41f4b26bc7ac45d136b0c175d899fc4dedc50fc0d2752a6359e148f6140b29ef
font_01_sfnt_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 10272 bytes
SHA-256: 4a3392db692c837c26c9cfca0f3d77eea8b0e8647efecc132229eb02d2766068

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