Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e53d9600c49da3…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 03:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7b7fb382cad7f0cb8cce8005df2130f SHA-1: 538a4f73f0224a5409e72d7b8a1313bf1fd087eb SHA-256: f3e53d9600c49da36a6f89ba4cdf2997df81d12ad9a2fbc29c1de8d914015c3c
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, indicating an attempt to direct users to malicious content. The document body was unreadable, but the heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hausdergesundheit.net/userfiles/files/49991661401.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a29e6ccfa7---venevafonedo.pdf
    • http://pcserviszlin.cz/ckfinder/userfiles/files/65120414519.pdf
    • http://abwplazaview.com/uploads/files/rawivufezite.pdf
    • https://ceiling.holcom.vn/webroot/img/files/bakoxumevomatosariwofog.pdf
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/jogevufevasupopejo.pdf
    • http://beijingxinzhi.com/userfiles/file/20210920000753_1879931036.pdf
    • https://mygrind.ie/userfiles/file/rikitolomogemiri.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/riramoxenumekaluxu.pdf
    • http://maskaevlawyer.ru/userfiles/file/91478753329.pdf
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/40733060604.pdf
    • https://allora-tour.by/var/upload/file/96072022460.pdf
    • https://almavilag.hu/files/files/10724268902.pdf
    • https://asiapharma.la/files/files/44889629280.pdf
    • http://keitbg.com/images/files/xisebosowupekipigosugabo.pdf
    • http://dansungsala.com/uploads/files/73868766439.pdf
    • http://icsbc.ru/fuploader/file/62868446490.pdf
    • http://umrllc.com/userfiles/files/9197509030.pdf
    • http://svenskafik.se/uploads/fckeditor/file/tasivibenofazejukujinini.pdf
    • https://mimpidia2.com/contents/files/bunakasixopikulixenexip.pdf
    • http://brilsports.ro/userfiles/file///81583560037.pdf
    • http://rainternacional.com/userfiles/file/moxuxeme.pdf
    • http://vallovin.it/userfiles/files/nubidoter.pdf
    • https://chingchia.com/uploads/files/202109020707551985.pdf
    • http://snap-drone.com/userfiles/file/73724936083.pdf
    • http://oldmotorsclub.com/files/file/golazurakowanuw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=can+dream+league+2020+be+played+offline
    • 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_off0000de9e.bin
81e8c4965dfc09c10c0494017bc2558346955b4c938eb4d57a1c47c51303aaec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 11204 bytes
font_01_sfnt_off0000f86a.bin
9406bfc4fe179d4a47172b16506238af45d64875f12362543259269725ec4690		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 18140 bytes
font_02_sfnt_off00012752.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 16792 bytes

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