Malicious PDF — malware analysis report

Static analysis result for SHA-256 141c55b4dc928b78…

MALICIOUS

PDF

77.6 KB Created: 2021-03-18 16:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40a7b84635d111ca5e462826c116a731 SHA-1: 46e7e73ed00b5cffd8acea80f2a25e474ee34b75 SHA-256: 141c55b4dc928b78d44cf20ef6408065e237af514c5dbbd0b1a5d276dd0400dd
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings for terms like 'gta v apk obb mediafire'. The primary malicious URL, https://jumiwimov.ru/wix?keyword=gta+v+apk+obb+mediaf%25C4%25B1re, suggests a lure for downloading game-related software. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/wix?keyword=gta+v+apk+obb+mediaf%25C4%25B1re
    • https://marabobufazezi.weebly.com/uploads/1/3/5/9/135992859/9279307.pdf
    • https://pelozaxuji.weebly.com/uploads/1/3/2/6/132680784/deb192230dad69f.pdf
    • https://gitinegu.weebly.com/uploads/1/3/4/6/134648864/01c429eb59386.pdf
    • https://cdn.sqhk.co/zetanitanedo/cjaljj9/58853943646.pdf
    • https://cdn.sqhk.co/jigotove/gfjaheC/curso_de_ingles_basico_gratis.pdf
    • https://cdn-cms.f-static.net/uploads/4387919/normal_6047d7da38094.pdf
    • https://jiwenetitorod.weebly.com/uploads/1/3/5/3/135325203/buwuzinifajefuko.pdf
    • https://cdn-cms.f-static.net/uploads/4490949/normal_602f51474302e.pdf
    • https://cdn-cms.f-static.net/uploads/4489733/normal_5fd6849fb25b2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gizonukorad/annual_report_definition_business_dictionary.pdf
    • https://s3.amazonaws.com/pibabopuduj/minna_no_nihongo_fukushuu_answer_key.pdf
    • https://s3.amazonaws.com/jupudizadid/23176525015.pdf
    • https://s3.amazonaws.com/kisimujuk/comparison_between_eastern_and_western_philosophy.pdf
    • https://uploads.strikinglycdn.com/files/8fd307ba-c598-4b41-a89c-248e04edc726/retatevutiwisesisom.pdf
    • https://s3.amazonaws.com/norozovijalu/time_clauses_worksheet.pdf
    • https://s3.amazonaws.com/wazorixekunafob/54625667274.pdf
    • https://uploads.strikinglycdn.com/files/cd77ed6d-2777-4922-a412-ff19c4a336c7/what_raw_materials_from_the_environment_are_needed_for_photosynthesis.pdf
    • https://s3.amazonaws.com/tokatefozude/narasimha_movie_480p.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_off0000f08e.bin
dd8b575d3c5a1f3d21ab62a4651c7da5786027cc7c07ac666edd9c1b402f8e8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 5304 bytes
font_01_sfnt_off00010298.bin
504fad013d07cdfe6a47eb61744c8576873595335a2c8c43e4984179ba109e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 10872 bytes

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