Malicious PDF — malware analysis report

Static analysis result for SHA-256 a508a576e354a740…

MALICIOUS

PDF

75.8 KB Created: 2021-05-12 09:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 810e2da717ea4706372248c2984f0ae3 SHA-1: c54703b7800d59a3ea7da76adf37c7bf5e2cd355 SHA-256: a508a576e354a7405c27804e5248e9d7d2036cf84b62055c39431d37f9243d38
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious content distribution scheme. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The primary URL, https://jacksth.ru/strik, appears to be a redirector for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=accu+chek+aviva+plus+glucometer
    • https://tekoriforeta.weebly.com/uploads/1/3/4/6/134639422/mewosaluximuralubi.pdf
    • https://zizonilorixu.weebly.com/uploads/1/3/4/7/134772478/zajutijejur.pdf
    • https://vunidiripoga.weebly.com/uploads/1/3/1/4/131453449/5021304.pdf
    • https://webenewosa.weebly.com/uploads/1/3/1/4/131409170/1401602a.pdf
    • https://xegegoxona.weebly.com/uploads/1/3/4/4/134470803/3862036.pdf
    • https://puxetesotomu.weebly.com/uploads/1/3/0/7/130739839/dilisomab.pdf
    • https://wurixexaf.weebly.com/uploads/1/3/4/8/134865586/komifizoviv.pdf
    • https://xebadaminel.weebly.com/uploads/1/3/4/5/134523447/womivupexo-xukasabuw-vumijiwerigilu.pdf
    • https://gadiziwit.weebly.com/uploads/1/3/1/4/131406086/kuxumuzapovesitowik.pdf
    • https://sagerogokijisoj.weebly.com/uploads/1/3/4/6/134601402/b6d736be539.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_6dfff45cb9884f57a2af5dba2356f5d2.pdf?index=true
    • https://s3.amazonaws.com/vifusupegiza/daxujoxeton.pdf
    • https://s3.amazonaws.com/gawabog/59898971275.pdf
    • https://s3.amazonaws.com/pesetufavo/international_financial_reporting_standards_advisory_council.pdf
    • https://s3.amazonaws.com/vekodupiwarobi/agathiyar_old_tamil_movie.pdf
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_1236007ecd5d415b80e25093f3a1c9c1.pdf?index=true
    • https://s3.amazonaws.com/nakuzafol/digitech_rp360xp_guitar_multi-effects_pedal_review.pdf
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_a46f6624d3ed4157ac83e9c3c62924ab.pdf?index=true
    • 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_off0000e96d.bin
0639bae4fbe354f46c1f5f2ec45f8d636185a1e8e80d7d28dc58e00d03089055		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 5460 bytes
font_01_sfnt_off0000fbdb.bin
48ebbe77b4152398089d95210e80f5497d5e6f8ed14fd4788e066cf9fb18b162		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 11232 bytes

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