Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c2f40f8324a4f1…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 01:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b02acf9b966c8be361c06b261822470 SHA-1: 9c4c69a26cec8674e751062caf08994d17d259f8 SHA-256: c2c2f40f8324a4f133f6430dc56350f51efc032aa9b032ad39d1082ebbb1088b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a phishing or link-farming attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on disposable hosting. No scripts were extracted, but the nature of the embedded URLs and the heuristics suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://orrizon.ru/images/file/ruzomukokupawiru.pdf
    • http://strandedtattoo.info/file/60094859730.pdf
    • https://www.hkha.com.hk/ckfinder/userfiles/files/71920055628.pdf
    • https://sharenkon.com/files/tasidafaxugeb.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/tajejoz.pdf
    • http://ljjxmining.com/uploadfile/file///2021091414453715.pdf
    • http://sgyscom.com/upload_fck/file/2021-9-6/20210906111447392120.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347ec6c3b79---73378537407.pdf
    • http://oa30us.com/userfiles/file/jetenibaporapirimoj.pdf
    • http://mazdooradda.com/userfiles/file/44660397373.pdf
    • https://www.winsum.frl/ckfinder/userfiles/files/79517377158.pdf
    • http://foodzipo.com/uploads/userfiles/files/zawij.pdf
    • http://wernitznigg.at/files/42841895009.pdf
    • http://finproekt-msk.ru/userfiles/file/xivigadivinerusagifa.pdf
    • http://favourtec.com/attachment/file/76460749439.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4e6751a9e---34707260289.pdf
    • http://gaushalango.com/uploaded_files/userfiles/files/wagefilejenum.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/30262715631.pdf
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/kojexujexikibarufapupigi.pdf
    • http://peoplefoster.com/pliki/76447704982.pdf
    • http://sbsinternationalschool.org/userfiles/file/16266747146.pdf
    • http://jncs.kr/page_data/file/20210917170409.pdf
    • http://thietbiantoanttk.com/uploads/files/risuxosivufamasafovebisog.pdf
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/43372292340.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+cne+app+android
    • 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_off0000e667.bin
f0ac570087766c1e247bd94a9e98abfa6a8505eeed4a68d21f9484b3f6eac1b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 18140 bytes
font_01_sfnt_off00011596.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11596 16792 bytes
font_02_sfnt_off00012dad.bin
080cfd8cdddb15265fe79645cae16bcba39ee47ae7e0ee2938873bfc074c7d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAD 10556 bytes

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