Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd85f63ecc2bd90…

MALICIOUS

PDF

91.1 KB Created: 2021-09-19 14:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d910e216ed1517f3c124101ff9cde56 SHA-1: 9d65514a4988055e12f1e5d8efde6f28e2d2c4af SHA-256: cbd85f63ecc2bd90bbe241668f683959b0b9c02e2cd301cdc1f357cd1eb92a12
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating it's a phishing trojan. It contains embedded JavaScript and numerous external URIs, including one pointing to a raw IP address, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript (T1059.007) indicates potential for further exploitation or redirection, and the overall nature of the PDF points to a Spearphishing Attachment (T1566.001) delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=which+phone+can+be+rooted+easily
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/52098252569.pdf
    • https://ceral.pl/ceral/pliki/file/dejapudupigobufavavak.pdf
    • https://phatgiaolongan.com/upload/ckupload/files/vatejizugubefitelez.pdf
    • http://etkindenetim.com/resimler/files/gejuvexax.pdf
    • http://musicfriend.vn/public/default/ckeditor/files/15330302820.pdf
    • http://xprchemical.com/upload/files/76977174668.pdf
    • http://119pump.net/d/files/lasisineje.pdf
    • http://honyi.tw/ckfinder/userfiles/file/jarasinuxesumef.pdf
    • http://railwaysrailroads.com/upload_files/files/45181087001.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/titebejarasab.pdf
    • http://185.33.116.145/~acus01/upload/files/58888289565.pdf
    • http://maydemtienvn.com/upload/files/787888377.pdf
    • https://tspinstruments.com/cache/fck_files/file/2665615499.pdf
    • http://vinaaquachem.com/uploads/files/lemereduvexone.pdf
    • https://badoza.net/userfiles/file/65702179097.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161434ef12e22f---82002728458.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f45e7ab76ca278e52bad6ac4c998c849/konepidukubunenege.pdf
    • http://kennycojewelry.com/userfiles/files/202109/1630934977.pdf
    • https://egokituz.org/files/galeria/files/dofozodubadekekene.pdf
    • http://degrossier.nl/uploads/file/87412184309.pdf
    • http://gtlfuelmarine.com/userfiles/file/zajefawipanizemetowibok.pdf
    • http://twfindia.in/userfiles/files/nabojinadazoxosokarareni.pdf
    • https://aluminiosarla.com/userfiles_arla/files/61844305703.pdf
    • http://worldwidestationeryholdings.com/files/file/31490629895.pdf
    • http://rustproofingottawa.com/userfiles/file/53861161219.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 16792 bytes
font_01_sfnt_off000117e3.bin
300b32548c3ae0b62590c06890ec754d686e3a4203690bd0ced984e6b9686896		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E3 10860 bytes
font_02_sfnt_off000130b8.bin
56785dd0745bc492332cfcc7a22f43d15d8aa0d5f32bdb48401d46d55da9bf22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 17536 bytes

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