Malicious PDF — malware analysis report

Static analysis result for SHA-256 b769b7cd7b842719…

MALICIOUS

PDF

91.2 KB Created: 2021-03-21 06:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c47b2dd8c25b38b06e6b6fd26942deb7 SHA-1: 7fac03fe82e260d4ac317b4b4ec4442d4d723439 SHA-256: b769b7cd7b842719c0daac76f88fb53524c0464318e91c170753b91c83c08ffe
136 Risk Score

Malware Insights

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

The file is identified as malicious by a ML classifier and ClamAV, and exhibits characteristics of an advance-fee scam. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content. The presence of numerous embedded URLs, including the primary one at https://druttle.ru/award, indicates an attempt to redirect the user to a malicious site. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate the scam by dynamically loading content or redirecting the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://druttle.ru/award?keyword=radical+candor+pdf+free
    • http://fetesitomer.mygamesonline.org/80978517126.pdf
    • https://static.s123-cdn-static.com/uploads/4417213/normal_5ff3a52d1037d.pdf
    • https://cdn-cms.f-static.net/uploads/4403534/normal_6023c749974fa.pdf
    • https://cdn-cms.f-static.net/uploads/4472764/normal_604f486f8e847.pdf
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/zorotunesarop-pimamisifa-gizaw-buzal.pdf
    • http://tugokutuli.scienceontheweb.net/calvary_hillsong_lyrics.pdf
    • https://cdn-cms.f-static.net/uploads/4447647/normal_60337e925e024.pdf
    • http://kutatit.getenjoyment.net/hunger_games_mockingjay_chapter_12_summary.pdf
    • http://fafekaju.22web.org/39337792458.pdf
    • https://ratesikumetu.weebly.com/uploads/1/3/1/1/131163578/9610671.pdf
    • https://togurugake.weebly.com/uploads/1/3/1/4/131412858/bazakajo-tagobagok-madig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mudepenota.epizy.com/14420725503.pdf
    • http://bujuxuvumelijet.epizy.com/fijatusosix.pdf
    • http://lamisegowa.epizy.com/53842795973.pdf
    • https://s3.amazonaws.com/nuxulikiwab/24409487043.pdf
    • https://s3.amazonaws.com/nakuzafol/bachiko_nannali_song_lyrics.pdf
    • https://s3.amazonaws.com/bizamesuwepe/flint_township_water_quality_report.pdf
    • http://pewubik.atwebpages.com/sequences_in_python.pdf
    • 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_off00012597.bin
5339d2f6880588b572c85c02a4c26534c69389faf0ac34d89bfd931aaae4ce47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12597 4976 bytes
font_01_sfnt_off0001369b.bin
304627f0e071944bd3dc4d30a2a3bc908a8efacac31f51c03f4417f9f063c410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1369B 11976 bytes

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