Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34bade08087373e…

MALICIOUS

PDF

75.3 KB Created: 2021-09-22 20:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 106c0b01d07e9a01e9278a60ff5644b6 SHA-1: 250be2f7005d3a9c782823909a777f6c63c3c575 SHA-256: b34bade08087373ea81f1ed36502b91d71ef45f94b69aabf371b8894dc5983c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=restore+my+tablet PDF link annotation
    • http://phamtrangia.com/upload/files/nadasutejixusud.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/nokebapak.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/34711627380.pdfIn PDF document text
    • http://dogable.de/userfiles/file/sijipa.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210909_CB726834A240DE4E.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/93951571068.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/rabusemi.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/fupuzadalelode.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/xemotebewatenigi.pdfIn PDF document text
    • https://schmitz.cz/res/file/sowujez.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210908_113756.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/kafepufuwawakotiri.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210904035349.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/88984663643.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c790cb2674ccd322e019f79e2a7a7ac2/42015202764.pdfIn PDF document text
    • http://adveotec.com/img/file/roredupozar.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/51107835636.pdfIn PDF document text
    • https://egca.fr/userfiles/file/jerurizogibe.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/27874396703.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/90380118704.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/mesosuj.pdfIn PDF document text
    • http://forum-auto.ru/data/files/42478613431.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://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_off0000c2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DD 17620 bytes
SHA-256: 3b405ea64b20a7585f1f03d1bc3567ee066ba082238937356c2d45c8081776c1
font_01_sfnt_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001086d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 10372 bytes
SHA-256: 3f53ba6022658934e20ce215da14dadc23d56bef211611f8656c760fa4120204

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