Malicious PDF — malware analysis report

Static analysis result for SHA-256 100fcac03bd3b0d1…

MALICIOUS

PDF

78.6 KB Created: 2021-09-12 14:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfd7da99ce6f6e8c3dd109b108d9851f SHA-1: 7f979af9854e6f379837cdfe0b9bf2e0ce8abcc3 SHA-256: 100fcac03bd3b0d1a5310dbb3529d66fe4d84beaa57a92307027df7fcfb1a541
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/rurenifoxogi.pdf
    • https://bi-kiesabbau.de/cmsimple/images/file/ragamixivepeziwutexu.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/xidekonor.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/dizixula.pdf
    • http://fasson.vip/images/editor/files/20298067878.pdf
    • https://art4you.sk/editor_uploads/system/files/69606438330.pdf
    • http://azco.friend-match.com/upload/files/gifejuzuz.pdf
    • https://zenmobile.in/jaipriyart/uploads/files/nurewotupoxijufug.pdf
    • http://graciaindoutama.com/kingkong/userfiles/files/vuvaz.pdf
    • https://digireg.pl/upload/liwixegafakilamaxariz.pdf
    • https://egf.tw/test2/images/file/boduteberumuxu.pdf
    • http://vrakskodamnetice.cz/file/maxoxagegemaf.pdf
    • https://digireg.it/upload/60745786612.pdf
    • http://dzstock.com/Upfiles/file/dalebazitetelisemo.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/395aac153366283ab2bc763d17e262c7/34028946608.pdf
    • http://www.urbanwaterways.info/files/54727535677.pdf
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/67413788608.pdf
    • http://ageddfjtj.pretty-match.com/upload/files/33087388188.pdf
    • http://siamsankyo.com/Uploads/file/64822142576.pdf
    • http://olympicburger1988.com/uploads/files/75464179482.pdf
    • http://vagtteam.dk/userfiles/Files/tifuzinijexesiwip.pdf
    • http://newabel.com/ckfinder/userfiles/files/77459372878.pdf
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/jivalilitun.pdf
    • http://market-oborudovanie.ru/upload/file/soputuzaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=theme+of+the+poem+invictus
    • 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_off0000d069.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD069 16792 bytes
font_01_sfnt_off0000e880.bin
1e2e82eb9694fa28435d063d4c60d78cba1eb26ae5f07fb44ef72e0da70ab690		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 10568 bytes
font_02_sfnt_off0001007f.bin
b4b0428cc871294146b991b1b7fdd9c02a27c88f559aa53bd49750f97c28c60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 17180 bytes

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