Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e19d5117bf3df3…

MALICIOUS

PDF

98.2 KB Created: 2021-03-02 12:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f291132e4f734988db549c2d89b0553a SHA-1: 1b6056c7f8f919959fcc122c0f37cc4b70300a05 SHA-256: 71e19d5117bf3df3597629832748c270fb1010272e45832171e86d20e31171d1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically flagged as an external URI pointing to 'maypoin.ru'. Heuristics indicate the PDF acts as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature, likely involving a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/wix?keyword=utah+sweet+pomegranate+zone PDF link annotation
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/nupawaxake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425917/normal_601900f331554.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373516/normal_5ff797616fafb.pdfIn PDF document text
    • https://tijoramamuguko.weebly.com/uploads/1/3/5/3/135390581/xitatu.pdfIn PDF document text
    • https://severuzilun.weebly.com/uploads/1/3/4/7/134710190/1bf410265ea9.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/safago/93246134834.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/41030182168.pdfIn PDF document text
    • http://bitines.myartsonline.com/41258240083.pdfIn PDF document text
    • http://zizajaw.epizy.com/92506748612.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/35264406846.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BD 5332 bytes
SHA-256: 8b1f51b8d994d4cfed2beb095a52c11e559201fc42365b460a12ad68274b28f6
font_01_sfnt_off000143d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D3 10184 bytes
SHA-256: 11918441d5715fb0d34b506d0f3c1f88b661f7bc8444305280052d7431eceeac
font_02_sfnt_off000166e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E5 16084 bytes
SHA-256: 61ab26ef3059b09256b8547e5574ce70db9c335fe5fa9adc58a7cf2ba22ac202

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