Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d6eccf801789b7…

MALICIOUS

PDF

72.0 KB Created: 2021-09-13 23:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e841bd35c8d94aad6fb0ad2cba4c345e SHA-1: 3b5dce78fe02cdac540f6bcbc6ef41301ca8be93 SHA-256: e9d6eccf801789b780c42f9619a0fea57bf2a66974278ab83d5072fa7ecbdf7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://minipowerpack.net/upload/files/kefoz.pdf
    • https://magatek.com/documents/file/6646346359.pdf
    • https://markyatirim.com/resimler/files/vajulutuxeti.pdf
    • https://aawyx.com/sites/default/imageuser/file/45249119589.pdf
    • http://nutranghongngoc.com/media/ftp/file/bofifu.pdf
    • https://kalashad.com/userfiles/file/78390126514.pdf
    • http://abwplazaview.com/uploads/files/4751047460.pdf
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/datidejadawa.pdf
    • https://cfacgroup.com/uploads/FCK_files/file/nepawopiburetulunoxija.pdf
    • http://contua.org/userfiles/file/33596588761.pdf
    • http://zagazzo.com/userfiles/file/pusoge.pdf
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/kuxafizexabojis.pdf
    • https://zagi.hr/files/nexoronozovelerarajo.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ac67710f6eda5d2f1b1a84f7f4b8e8c8/wozoluwibuxujarugalami.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/104718380.pdf
    • http://brandiassociati.it/userfiles/file/powusezuni.pdf
    • http://poketomecam.com/uploads/files/54603221464.pdf
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/49669439073.pdf
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/botevapoketabowomigek.pdf
    • https://immo-macedo.lu/userfiles/files/83451371279.pdf
    • http://only-svet.ru/upload/files/wamifif.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f2a07e7c80060acd18c1bc8f264775ab/66307479711.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rs3+ios+release
    • 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_off0000b9e0.bin
ccf6255d6fd0cc6656d8300473fb92655a871f3316b54ab008933e33d918a7e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E0 16584 bytes
font_01_sfnt_off0000e46f.bin
d3e3ff427841d7e01a2dc7f7ddba83facd0214b799f5bf86ef329d510a7a99f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 10116 bytes
font_02_sfnt_off0000fb20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 16792 bytes

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