Malicious PDF — malware analysis report

Static analysis result for SHA-256 579631d0e28ef58c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 13:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ed6812d9a473c70445570013938bcdb SHA-1: 0cca055ad1ecc2e4196a5848ed2d6c2ad89fe68c SHA-256: 579631d0e28ef58c8e7441a9d95bfa24a2721a0a3b610506a3595bb13b18d467
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan. It contains numerous external URIs, including one that appears to be a lure for downloading a game, suggesting a social engineering tactic to trick users into downloading further malware. The presence of many distinct hosts and links indicates a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=download+game+spongebob+squarepants+battle+for+bikini+bottom+android
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb4d39b59---56426267738.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210902035814.pdf
    • https://morethancars.eu/uploads/edytor/file/72923129982.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/abc0e9124e744f81ff4793d2ba21f232/6429298450.pdf
    • http://www.galiantsolutions.com/emailimages/file/56823795198.pdf
    • http://dwornawodzie.pl/userfiles/file/bolutoxojozisokutepet.pdf
    • http://1544-7419.net/upload/fckeditor/file/40906664540.pdf
    • https://wecareu.net/ckfinder/userfiles/files/lulepujivikotefefokabara.pdf
    • http://asesoriazabalburu.org/azaba/files/file/85577402951.pdf
    • http://meghdoothsuzuki.com/uploads/14435230962.pdf
    • http://gysanya.com/upload/file/210906194654318090bjt19urmt809.pdf
    • http://anpo.vn/upload/files/dugud.pdf
    • http://e-baze.lv/images/site/file/43945417186.pdf
    • http://papianiarch.it/userfiles/files/96951578300.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/70879406613.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/11071380507.pdf
    • http://medicaldistri.com/ckfinder_files/files/ferovuromapinezen.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e357301f0---34975108372.pdf
    • https://tennis94.fr/img/pics/files/sexujumapipilixusolise.pdf
    • http://duef.ru/public/file/bugupilepowawojefuzipe.pdf
    • https://nuttydog.hu/ckfinder/userfiles/files/21171150964.pdf
    • http://srtcivilnorth.com/ckeditor_file/files/9736019965.pdf
    • https://zapret-rf.org/web/img/podborky/files/bewiketiwexefarumaliwemu.pdf
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/nikaberezuxudut.pdf
    • http://zhengfutz.com/v15/Upload/file/202191323643663.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_off0000d9fc.bin
fbcacff8130686850b483e581065190bc2d3979c90cabd85a837c243a2c48b14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 18200 bytes
font_01_sfnt_off00010962.bin
6c40155a3c846f72f4b889dc0b7d1452aaf336fe13d7aa2dc62144f31ea163f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 11408 bytes
font_02_sfnt_off0001238f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 16792 bytes

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