Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec6f5cfac9311ef…

MALICIOUS

PDF

69.7 KB Created: 2021-09-21 03:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f23aa05e7b85f952cdfd853fe5fd63d SHA-1: 3d8e11dc104cf954054c586d099dda51e828c25c SHA-256: cec6f5cfac9311ef6e98bb8012f4ac04793a8ace36c3e0388f681182fb46fa0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains a large number of embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crisismobile.com/ckfinder/userfiles/files/99778717446.pdf
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/kurikefujevafevikeju.pdf
    • http://www.yoko-ono.be/images/userfiles/file/genowad.pdf
    • http://villaelen.it/userfiles/files/18191529822.pdf
    • http://beming.com/ressource/site-image/files/taxaviwigezanulerofevaf.pdf
    • https://ecoolteh.eu/galeria/file/fumodaduzoxetuparabe.pdf
    • http://rasmesafar.net/basefile/basefiles/43990715178.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/rukob.pdf
    • http://standardamulet.com/files/files/4986794640.pdf
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/76522159782.pdf
    • https://gulf-rope.com/images/bulk_images/files/44406893400.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/4g8jas1uao0qf8ffiiv2b8tgmf/78688839258.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/4060ccc1445a0b682e9c8b2c76f104a3/nufisodisepozepifowujox.pdf
    • http://shouce-image.kuchuancdn.com/Public/resource/files/wopafog.pdf
    • http://drivescuolaguida.it/userfiles/files/dodipipiwotamurilunivuge.pdf
    • http://csc0851.com/userfiles/file/20210903123322_mor45t.pdf
    • http://halanmilk.com/upload/files/zikarekotiritij.pdf
    • https://ppkh.net/userfiles/file/sofupe.pdf
    • http://the-bom.kr/upfile/files/78102785870.pdf
    • https://nucamsa.es/userfiles/files/36464662477.pdf
    • https://tmtteks.com/files/livojekuwodi.pdf
    • https://alternativecarrepair.nl/userfiles/file/50363235276.pdf
    • http://sobateracota.ro/mm/file/vidogazegafup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=50+shades+of+gray+download+full+movie
    • 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_off0000afa2.bin
62738060b22806060646e876a9c39f78b3d584edd4e64a32899b3978d81b3c6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA2 11228 bytes
font_01_sfnt_off0000c99b.bin
561aa13562295094daa1ba635dda8db1288217fe9747ba93a70946674e73b65e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 15452 bytes
font_02_sfnt_off0000f114.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 16792 bytes

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