Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18bb3db94f7d4ef…

MALICIOUS

PDF

68.0 KB Created: 2021-09-28 21:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab3d49d9dda5e15b2982f5b46423e855 SHA-1: 1604016f75fb1b2a290d4b420823a3d1e110524e SHA-256: e18bb3db94f7d4ef0200bfc1603af2230c58e21db61b198eba07aaef94626063
126 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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript to redirect users to malicious sites, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://abzesolar.com/uploads/files/37051055153.pdf
    • https://maintogelonline2.org/contents/files/96276551519.pdf
    • http://topbuild.net/content/xuploadimages/file/30065848999.pdf
    • https://tebra.si/userfiles/file/karurubidoxuwo.pdf
    • http://domki-kopalino.pl/pliki/lelonativaturubaz.pdf
    • https://deesudcoolingtower.com/userfiles/file/tugaw.pdf
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/92854463276.pdf
    • https://cmottaviproductive.it/uploads/file/71680297861.pdf
    • https://pharmnet.cz/ckfiles/files/files/55705658780.pdf
    • http://stavebnevyrobky.sk/www/upload/files/gidokuliwuwikofuwotekolo.pdf
    • https://pingthye.com/userfiles/files/bitipinefawagexa.pdf
    • http://sibzakon.ru/ckfinder/userfiles/files/89133493625.pdf
    • http://abwingscolley.com/uploads/files/talurogewefasogavawolep.pdf
    • https://laptopserwis.com/app/webroot/media/files/93059102933.pdf
    • http://wideanglepackaging.com/ckfinder/userfiles/files/37811047523.pdf
    • http://abwhopewell.com/uploads/files/39007152955.pdf
    • http://iglozawiercie.pl/zdjecia/file/12901180716.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/21vka78o38uoq0ua78869t59ot/22973996932.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d53c9ad12bfc071ceb2d9053eab3d777/xavegidisesukero.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=kodi+tv+box+download
    • 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_off0000adf5.bin
5dde945bf9afa183fbfc0bd2533cbde0654ad158330202e6e67b99e7ce73ee33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADF5 14892 bytes
font_01_sfnt_off0000d3ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 16792 bytes
font_02_sfnt_off0000ebc3.bin
e23a1598a9d89adb058ea8aa4d5d0aa60db9a21a1dad506649bf839e1ce4851a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 10228 bytes

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