Malicious PDF — malware analysis report

Static analysis result for SHA-256 b867dc0ef4699fab…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 20:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa2f00728a2cbcde6bc9348e1812bcc0 SHA-1: 2d97e7b6f23c8e0e47c909245369e54a97751a98 SHA-256: b867dc0ef4699fab7d6c577271a8bcf73100576d8e678eda8f5f7e778b56fac6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting, suggests a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://archism.ru/uplcv?utm_term=rupaul+drag+race+season+13+episode+1+online
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/zagunalemobelajofebejina.pdf
    • http://www.impactit.in/ckfinder/userfiles/files/26486378093.pdf
    • https://ribaczpeter.hu/files/file/48768197764.pdf
    • https://nmg.lv/img/uploads/files/botiberevogoz.pdf
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/tiwip.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/jmdqounnbioetd03hd1mi9mau4/31983278587.pdf
    • http://master-stroi76.ru/userfiles/file/27251414848.pdf
    • http://aspbae.org/userfiles/file/66968181807.pdf
    • https://lingchuanfloor.com/app/webroot/userfiles/files/81985054795.pdf
    • https://taumed.kz/upload/2021/09files/210915190918849612scxvp.pdf
    • http://brava-ekb.ru/userfiles/file/vizegekifaxezotozezewag.pdf
    • http://bouwbedrijfansing.nl/userfiles/file/palovoziledimadowurubu.pdf
    • https://xtrafitcoaching.com/www/images/files/jezudesakazefitarolenu.pdf
    • https://kaptenhoki.info/contents/files/vijudonilefowijiwugupo.pdf
    • http://apothepharma.com/upload/files/giraxejol.pdf
    • https://cowichanseniors.ca/userfiles/file/38328986879.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c7e8128a5745d142dcfbd2ffdc42fdf5/litepopiwaf.pdf
    • http://motolargo.pl/userfiles/file/4386830506.pdf
    • http://kxzyjy.com/CKEdit/upload/files/75856656004.pdf
    • http://kuryakyn.ru/userfiles/file/demiwizofiwaxagumef.pdf
    • http://shahgrp.com/uploads/57414862786.pdf
    • http://asesorgubernamental.com/images/file/51867610699.pdf
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/rasutipakak.pdf
    • http://lovepetclinics.com/file_media/file_image/file/nuviperarepoxiledavapu.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_off0000b34d.bin
c7faa968dd6ae1aaf6919059b36c5c3b9dd0848f41e15cf5f08407d992ad5029		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB34D 15676 bytes
font_01_sfnt_off0000db86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 16792 bytes
font_02_sfnt_off0000f39d.bin
c7b3a128165e997ba7b31173f8ac800fc4cf02c5b085ac7e056c27058b14c3c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 10960 bytes

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