Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9b54fe360c7d89…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 05:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 961d1713b49c45e8423fdb94701ea7ce SHA-1: 70fa4a278fff5c368f496362731808ed1cbfe702 SHA-256: cc9b54fe360c7d898c8021a4fbf4d381754a858913d257f90d5cdc2b9ba34af6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to disposable hosting sites, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect the user to a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://systemsbiology.at/uploads/assets/file/36307774034.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/pukazafuwujufefeme.pdf
    • http://mcenterdk.ru/fck_editor_files/files/gowizofu.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/srfrrel73a829n99c6c9qu81b4/23083603785.pdf
    • http://sivam.pl/files/file/gekekatalelif.pdf
    • https://tinhhoaxanh.vn/userfiles/file/24815940357.pdf
    • https://uslugiinzynierskie.com/eurostyl/photos/file/xapokejef.pdf
    • https://hrmconsulting.biz/upload/files/lasesobodidejug.pdf
    • http://mweb.cz/images/file/2340838877.pdf
    • https://faktxeber.com/resimler/files/fotuwevusosofigizoxalilis.pdf
    • http://hajnysport.cz/FCK_userfiles/file/nodifesamuxusadavumim.pdf
    • http://thumpamonpally.com/userfiles/file/gekotesadegabareketilexoj.pdf
    • http://bsinteriordesigner.com/userfiles/files/vinajitimepinapegonez.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/tolizo.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161347f48636da---67871689389.pdf
    • http://ipceurope.be/assets/file/76858341026.pdf
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/dodilakak.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=huawei+usb+modem+driver+for+windows+xp
    • 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_off0000d5af.bin
d21b8605cbd4de952473e0a54e37333ff7c498236f911d36aef331a9b2c67508		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 16072 bytes
font_01_sfnt_off0000ff55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 16792 bytes
font_02_sfnt_off0001176c.bin
0d253ae7bfd6fd28510d0440812190cb71d24ebd3655126cbe3407e3b3517634		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 11000 bytes

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