Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e7593826b4f605e…

MALICIOUS

PDF

67.5 KB Created: 2021-09-16 14:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f28e12f03d1d402d9cad513b904e887 SHA-1: 468bb57259c51a956227eec2ad7d26feb7a0f9e2 SHA-256: 2e7593826b4f605ed296c16280d38e9bf7ec53163185c08bbd637e1e9745b734
146 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical for phishing campaigns. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a dropper for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ledlight-lamp.com/mingyi/images/userfiles/file/53597666405.pdf
    • https://langumeistras.lt/i/File/98538554227.pdf
    • http://ustunongel.com/image/files/fokupituvuto.pdf
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/ruzitukememuj.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/tebopomef.pdf
    • https://rwd.webseo.tw/upload/files/67339774041.pdf
    • http://mega.kz/media/upload/files/digap.pdf
    • http://eternoohydro.com/d/files/gigopubagisinujitimi.pdf
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/90344201628.pdf
    • http://graczeonline.pl/userfiles/file/pulimutejotikav.pdf
    • http://portableandcool.com/files/files/lurudovu.pdf
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/mamaluzilotataderidat.pdf
    • http://becucci.it/userfiles/files/maxizaxaburef.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/35059576630.pdf
    • https://comtraining.cl/userfiles/files/kuxisazagotedixamiwo.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f014deee---79843616868.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/11040159133.pdf
    • https://sitarasign.ir/data/file/nagojeligonawuzikal.pdf
    • https://jagamimpi.com/contents/files/nufinenijeped.pdf
    • http://mxag.com/upload/browse/file/70273261243.pdf
    • http://alisawedding.com/upload/users/files/lawed.pdf
    • http://s2group.pl/userfiles/file/60116850009.pdf
    • http://amadpich.com/userfiles/file/metos.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2b8d562ed---28023821363.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+vomit+emoji
    • 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_off0000b0ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 16792 bytes
font_01_sfnt_off0000c8c0.bin
4d5d3de32c6fc410c6ea977787476db0ecab254f506b92ebc3f0683071d15d69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C0 13228 bytes
font_02_sfnt_off0000e915.bin
d4054740ae307421cb9518ee188a8e07f430f22ec83545dd34be75674f77cf37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 10208 bytes

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