Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc7fcfa52bb681e…

MALICIOUS

PDF

77.4 KB Created: 2021-04-01 03:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8c9fc671b2740b139af332bc03cb0b4 SHA-1: dacb68525c65100cbeb989cb12e857c4d0495451 SHA-256: 8cc7fcfa52bb681e553391fa9c5f0b60125c1499e0d1a18cfc77573d6405d33a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various PDF files, likely serving as lures or redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/wix?keyword=lord+of+the+flies+chapter+3+beastie
    • https://cdn.sqhk.co/samumosoxivi/megfnjf/bally_sagoo_albums.pdf
    • https://cdn.sqhk.co/tejikeluz/O8hh8he/69070208967.pdf
    • https://cdn.sqhk.co/daguvemet/hhhjQib/tokeliraresute.pdf
    • http://conicppjry.bid/kenafaxowudevonasoloniwig58prh.pdf
    • http://cherrypimp.online/worm._io_crazy_gamesqar2x.pdf
    • https://cdn.sqhk.co/foropogajag/PrihjbQ/vidgo_tv_free_trial.pdf
    • https://cdn-cms.f-static.net/uploads/4447265/normal_604e85f2e4273.pdf
    • https://cdn.sqhk.co/xugiwatokax/dSBjjgc/mijilumekeku.pdf
    • http://futup.ru/ronoxasepertad8.pdf
    • http://nashremont.site/xobitezivoguzibobehgt17.pdf
    • https://cdn.sqhk.co/kibukumivu/gc1ijyB/10064430417.pdf
    • http://aicberg.net/latex_template_doctoral_thesisbhty8.pdf
    • https://cdn-cms.f-static.net/uploads/4463788/normal_601b04c5bee8e.pdf
    • https://cdn-cms.f-static.net/uploads/4484834/normal_601a54cb7dbc1.pdf
    • https://cdn.sqhk.co/fekoguwiwu/ji6iihf/fugevalikebiwiwexevetik.pdf
    • https://static.s123-cdn-static.com/uploads/4445106/normal_5fec85b730afb.pdf
    • https://cdn.sqhk.co/xupodafib/Hidnwhj/41413413407.pdf
    • https://cdn-cms.f-static.net/uploads/4414341/normal_601477dca5ee6.pdf
    • https://cdn.sqhk.co/pupewudoj/iibe2K7/a_baixar_o_whatsapp_gb_apk.pdf
    • https://cdn.sqhk.co/zogobadakedu/idPEjhB/xuvunukuvok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_e8491a3263e34a5aa192413f8486a1d8.pdf?index=true
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_5ac42c3a4112421691bba01ee1bbe7f3.pdf?index=true
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_38bc0a8354b1443d860cc7c58f5ef558.pdf?index=true
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_cb486c4b0862479d9a87e95ade05b535.pdf?index=true
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_196571d0d1a54fd8ba8934b69448b426.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_off0000f23e.bin
a44cb47a7f8b98561ae5715b13450f2f1208874613769086ee5388b660174739		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 5488 bytes
font_01_sfnt_off000104df.bin
3a8640aa2cae34f82ee56eb04a6cb46ccd382de64bcf2d1b381cf41631aa3bba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 10212 bytes

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