Malicious PDF — malware analysis report

Static analysis result for SHA-256 2255975b4dfa2203…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 16:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a47531dcbdecac094048711cd4a60abe SHA-1: ddec457afcb0965dc572630d955da08128eb947a SHA-256: 2255975b4dfa220379cbb8e91268aa15dc322c54e144046cbdb9af968357bba5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are identified as part of a link farm on disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links. No scripts were extracted, but the presence of many external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=always+display+on+apk
    • https://incense888.com/uploads/files/202109080112586231.pdf
    • https://carparts-fixture.com/file/file/vuvixojinunuvuv.pdf
    • https://santevita-bg.com/ckfinder/userfiles/files/6618845956.pdf
    • http://salukool.ee/upload/userfiles/file/1201350865.pdf
    • http://mobilahomedesign.com/userfiles/files/fozaluferesokak.pdf
    • http://yjsyrj.com/userfiles/file/46615150121.pdf
    • https://vilus.cz/userfiles/file/35284723428.pdf
    • http://duquenne-moteurs.fr/webroot/upload/files/werepa.pdf
    • http://ahzycw.com/upload_fck/file/2021-9-2/20210902035222153497.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/nkbdrinp017ad3etn3othpsq8u/13580019618.pdf
    • http://zerosquareonline.com/file/61315979659.pdf
    • http://studiocariola.com/userfiles/files/vodelafejotuledafejefowe.pdf
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/kokukojefufe.pdf
    • http://themetamorphoseprogram.com/userfiles/file/nofugozu.pdf
    • https://semangkabiji.com/contents/files/30332017993.pdf
    • https://apsco.ly/userfiles/files/ralefugivemawanidezutofij.pdf
    • https://badanie-wody.pl/galeria/file/ragirenenukuzulovufar.pdf
    • https://careerroots.net/ckfinder/userfiles/files/36136805124.pdf
    • http://plncse.hu/php_data/file/83759525519.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141ba568324e---60638225129.pdf
    • http://guojingmall.com/userfiles/file///73317998772.pdf
    • https://xuanhongkhang.com/upload/files/sigurewutiguv.pdf
    • http://tecnoservizi.com/userfiles/files/fomotametiba.pdf
    • http://myoffice2561.sesao33.net/UserFiles/File/xegezorapulixudodoluk.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/gomuguko.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_off0000e04e.bin
0e1d3d6c89717ac2a8c2c18200555322f01255e15e53efdaf5b5e09e3f00fbe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 19284 bytes
font_01_sfnt_off00011347.bin
a2a27e987e8d369a3af890d03550527e62c4b1d7fab3ba00c72edc0543c076c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 10328 bytes
font_02_sfnt_off00012ab2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB2 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.