Malicious PDF — malware analysis report

Static analysis result for SHA-256 541c63394898898d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 18:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2834252f0e4a446b2b1a9914c8a10286 SHA-1: 823c64b98cda7bb73b1457f3e9a5f90b5a90290d SHA-256: 541c63394898898d28db4b8deb63c0323f36105fcaedb2a60644d1dcd23a34c1
166 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a social engineering lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update, a common tactic for malware delivery. The embedded URLs, such as 'https://catamma.ru/uplcv?utm_term=english+textbook+for+beginners+pdf', suggest the document is part of a phishing campaign aiming to redirect users to malicious sites. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://catamma.ru/uplcv?utm_term=english+textbook+for+beginners+pdf
    • http://haokunchem.cn/upload/files/benudelixemexas.pdf
    • https://songhongresort.com/img/files/85020266944.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/lonamezifiwaroxabuliwuboz.pdf
    • http://tnmetalworks.com/images/files/kegutifusef.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161400334eb0b0---falipuwimadirez.pdf
    • https://samsungdvmklima.com/upload/ckfinder/files/pifufajimaxo.pdf
    • https://vicotelecom.vn/static/source/images/file/42433851814.pdf
    • https://kemxoi.vn/app/webroot/files/images/pages/files/9505111874.pdf
    • https://girisimhaber.com/uploads/file/gejetedofomumilepifuloma.pdf
    • https://btsis.com/upload/ckfinder/files/43803944019.pdf
    • https://mycocoa.org/images/upload/files/90008319694.pdf
    • https://anglarill.net/userfiles/file/64549366102.pdf
    • http://blesk-stroy.ru/userfiles/files/kegopofuzanijijab.pdf
    • https://metricgroup.it/uploads/file/18836740701.pdf
    • http://dinobajka.pl/Upload/file/tomanuwelirab.pdf
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210902_101855.pdf
    • http://www.herbertvanderbrugghen.nl/draft/50362995915.pdf
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/gozulebofuraduxaliragupe.pdf
    • https://mimpidia.com/contents/files/norepipukobata.pdf
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejedunudodapikuf.pdf
    • http://longruiglass.com/ckfinder/userfiles/files/20210905_142645.pdf
    • http://kyanite.tv/userfiles/file/28376143283.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/remuvuvuwewideloxemifi.pdf
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sovaregibanufakononogegiw.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_off0000d6ab.bin
a0abdfa0d1cfb4414d1b399b85b91d47ff16c20eb6480a25a8d7bbcecc0fad1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 10932 bytes
font_01_sfnt_off0000ef76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 16792 bytes
font_02_sfnt_off00010788.bin
c1f94c0dea79e005e519c6f3a3f547369a891f5f598bc012e24ab316bb867885		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 17812 bytes

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