Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a3bf469839d40b…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 09:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6a78e4eb855cee81e4ac062489ffeb4 SHA-1: 44edf428fb14d72492e17a7305de72a98a3b6adb SHA-256: 40a3bf469839d40b965dded661eb264a176fa902e661684c56ff3f3daade13fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to distribute malicious content or phish for credentials. The `wkhtmltopdf` authoring application suggests it may have been generated programmatically for this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://cructi.ru/uplcv?utm_term=how+to+take+lipstick+out+of+carpet
    • http://stonebreaker.at/rexer.pdf
    • http://rspon.pl/images/wyswig_images/file/62207049751.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/36539221209.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/lunugodedixirubetoziboz.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5865a4843---94685498652.pdf
    • http://obkladacstvikolar.com/content/limuxema.pdf
    • http://casadiriposomarsala.it/userfiles/files/xumazigibelomoxonaxeze.pdf
    • https://web-dev.ethioapp.com/websites/lightyearsahead/code/userfiles/files/bipawomuwosu.pdf
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/pogakiwe.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/99147173032.pdf
    • http://asiadomainstore.com/userfiles/file/gufonosonulafusejizigoz.pdf
    • https://rais.bg/uploads/file/87748891869.pdf
    • http://abwingssuffolk2.com/uploads/files/74453028.pdf
    • http://civicwomen.com/ckfiles/files/26318063318.pdf
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/tadikumike.pdf
    • http://cz-synergy.cz/data/file/sasomosaxope.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/mogewesesa.pdf
    • https://arerp.kr/data/file///vofatexitipopuvepo.pdf
    • http://www.rajpuc.pl/pics/file/33276402331.pdf
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/jusufu.pdf
    • http://www.almansori-ye.com/almansorifiles/files/rimeb.pdf
    • http://camdohungdung.com/upload/files/jojotarowibimekofaluzedup.pdf
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/dameliwunaf.pdf
    • http://abnicum.com/files/file/563313442.pdf
    • https://xanbiente.de/userfiles/file/fuzepubegizetemo.pdf
    • http://mail-business.ru/uploads/file/gunetulufosemeju.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_off0000b168.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB168 16792 bytes
font_01_sfnt_off0000c97f.bin
bec295f817069359f0dba92b013a2edb6df0c9c1971c6a1313c76f817a4c842e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC97F 10636 bytes
font_02_sfnt_off0000e20b.bin
9f6e2caabf01457f054abe2b806d77642a025150cda3d2fa9406f93cce16cb82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 15680 bytes

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