Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93052ac825b8292…

MALICIOUS

PDF

80.6 KB Created: 2021-02-25 01:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a821a4019acbac2cc92b89d8a06e834c SHA-1: 7daadd10ee215c9892786a3f80eed0600a33123c SHA-256: b93052ac825b829241254f179b43b97f3f5141045ba3336fc46dde628255f91b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=seafloor+spreading+worksheets+free
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5fe04a759d2a8.pdf
    • http://clobuss.ru/mafezxkam0.pdf
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/dobagudu_visujififosuga_xavadumowi_fiperikewub.pdf
    • http://azorocheat6.xyz/libro_fsica_2o_bachillerato_mc_graw_hill8ksv8.pdf
    • https://dumaxenuwumav.weebly.com/uploads/1/3/3/9/133997891/sajenixoko-dibesizafaz-renukedepunux.pdf
    • https://butapakenora.weebly.com/uploads/1/3/1/8/131871909/zotadekijewije-xosuw-najetise-nijoweren.pdf
    • https://jokuduzasaru.weebly.com/uploads/1/3/1/3/131381103/5821599.pdf
    • http://nanolenka.xyz/npr_one_sonosm8ufz.pdf
    • https://static.s123-cdn-static.com/uploads/4460725/normal_5ffc6cdf29b0d.pdf
    • http://indohealth365.online/43735737796bhrrn.pdf
    • https://static.s123-cdn-static.com/uploads/4388158/normal_6008cab475ff8.pdf
    • https://furuvisagibeveb.weebly.com/uploads/1/3/1/4/131453033/pigatewupadi.pdf
    • https://fozumazajafipal.weebly.com/uploads/1/3/4/5/134588547/zufikulilu-veguk-kudogepig-timajibo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jevelel/best_pathfinder_character_sheet_app_ios.pdf
    • https://s3.amazonaws.com/mujesogi/add_watermark_adobe.pdf
    • https://s3.amazonaws.com/degagaziv/tojajuxaponomazojoreguw.pdf
    • https://s3.amazonaws.com/dazinibonofobi/information_architecture_canvas.pdf
    • https://s3.amazonaws.com/xapota/purugusu.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_off0000feac.bin
748b1724174735199917d85291e5871ad510947bfcf00596e7164e35be84e1ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 5560 bytes
font_01_sfnt_off000111a5.bin
6080dc825da0152ebec1172faf6c5a4205c2774a31e7af90055449c244e3d37a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 10512 bytes

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