Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a4392d8ad1c90a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 06:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c93c9d43f4c7c6abab62bcfce4e66f20 SHA-1: 70131346558de16fc3a94d1319cff4316e136370 SHA-256: 71a4392d8ad1c90a2704d2ebe760aca22ba4964f8977123dafc411d0c701368f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, with a critical heuristic indicating it is a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. The PDF's structure and the presence of many links indicate it is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://skkl.cn/filespath/files/20210905100612.pdf
    • http://crmloccitanecr.com/campannas/file/67600633875.pdf
    • https://tutorbolivia.com/userfiles/file/puxukikazawufofog.pdf
    • https://otoform.com/upload/ckfinder/files/mazojefi.pdf
    • https://nicklason.se/ckfinder/userfiles/files/6043504188.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a1f191b8b---linefubogorolifoxezubum.pdf
    • http://www.medic-pneumolog.ro/fisiere/file/muvexotejujezenijuti.pdf
    • http://kristiankutschera.de/userfiles/file/zorepofavebametisojil.pdf
    • https://mrdak.cc/uploadfile/files/74182420486.pdf
    • http://candientuvibra.com/images/file/sasafifowaruwura.pdf
    • http://shipagents.nl/uploadfiles/file/jasobepodi.pdf
    • https://matricula.netlandschool.cl/files/86588363332.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9899d3351---danitamovuriluxer.pdf
    • http://dongshengcable.com/images/upload/File/mozewovidudepedexifani.pdf
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/pogumizijawolafisagosatuj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=asphalt+9+hacked
    • 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_off0000d808.bin
4778251837dac176cb032dc228d99a49e4950d4f5756093a4972e60fd76d2a50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 18748 bytes
font_01_sfnt_off00010899.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 16792 bytes
font_02_sfnt_off000120b0.bin
fb3b9d986393cf52be1a66d6c955b1f2037ce67d86babaacad73ddf10fe68468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120B0 10436 bytes

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