Malicious PDF — malware analysis report

Static analysis result for SHA-256 8548dab91be1a5e2…

MALICIOUS

PDF

94.1 KB Created: 2021-10-10 01:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f3ee8d24ccb29e9b218b39dd4db756a SHA-1: 7b7b632f9508890d5a23c7022b83b98ff42bb6cc SHA-256: 8548dab91be1a5e2ca1e340c672c1232df9b4bb6cb7eb2f1e71ad3859a5364b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://smidgel.ru/uplcv?utm_term=inside+out+brain
    • http://sun-green.de/ckfinder/userfiles/files/64039684591.pdf
    • https://derya.afmiletisimajansi.info/resimler/files/58577421086.pdf
    • http://topup-fight.com/ckfinder/userfiles/files/11161356232.pdf
    • http://propack-th.com/image/upload/File/nifebogonegekemipam.pdf
    • http://obkladlazby.cz/userfiles/file/bibewi.pdf
    • http://geostudio.eu/userfiles/files/pabaxasexomufipekazox.pdf
    • https://toocapen.com/files/17526877725.pdf
    • http://kalikraft.com/images/file/21742791641.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/jozixavulekekage.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a34adac175---11340916420.pdf
    • https://btegypt.com/file/kusuzugovopuxutipugivowi.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qr9d4asefl6vmkm670vdchqnk4/80338328949.pdf
    • http://vasvaripalmuzeum.hu/upload/file/nuwotesofuxuja.pdf
    • https://ofertaromania.ro/ckfinder/userfiles/files/32165816910.pdf
    • http://tainanrup.longi.tw/uploadfiles/files/20211007_142525_6908.pdf
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/14363286423.pdf
    • http://autosvilar.com/uploads/ckfinder/files/54280668995.pdf
    • https://horizontire.com/userfiles/file/11326877090.pdf
    • https://www.iieng.org/editor/ckfinder/userfiles/files/78173255771.pdf
    • http://sushimura1.com/uploads/files/27690771509.pdf
    • https://lanegarrett.net/userfiles/file/64835339710.pdf
    • https://hunglivet.com/uploads/files/202109111942285414.pdf
    • http://rhondachem.com/d/files/muvusojororimefefegeral.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_off00010a05.bin
75f4f6969d9ec5d6be4c315ffeb4bd46cd5350eb618f629cc045f3d941207b88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 18952 bytes
font_01_sfnt_off00013b31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B31 16792 bytes
font_02_sfnt_off00015348.bin
5240b9ef993a0f70bdffaebcc641f76f1237486c93e5f733050a68137e29c751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15348 10388 bytes

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