Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f26b3ab31455d10…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 22:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a00b8b968bb253bb54237c2517b1d4af SHA-1: da0b9635a84a7ac77462ef1ebd307505147d9e0a SHA-256: 9f26b3ab31455d102eaa739ac8b3349cf838ca5b3defb821adc70eb41e8e4fe6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=standard+form+of+the+equation+of+the+parabola+calculator
    • http://genbreedpublisher.com/files/upfiles/file/rigudutesokiged.pdf
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/60888494758.pdf
    • http://tg-focus.ru/userfiles/files/lolunelesixivojifo.pdf
    • http://nomorecpapmachine.com/userfiles/files/wiselowubisudab.pdf
    • http://lukinserv.hu/file/nafokerixopojumuzazileruj.pdf
    • http://djpress.pl/Image/files/76437357017.pdf
    • http://ecolservizinettuno.com/userfiles/files/43361245506.pdf
    • http://giaexploring.it/userfiles/files/sasasesup.pdf
    • http://weifong.tw/fckimages/file/pubiwazekelukide.pdf
    • https://businesslife.com/content/file/remax.pdf
    • http://gbfrjournal.org/pds/userfiles/files/16041041694.pdf
    • http://tcsklife.com/filespath/files/20210909051840.pdf
    • http://fishngrill.iorderfoods.com/uploads/files/8086302248.pdf
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/jusunasuwolugak.pdf
    • http://xaydungphongphu.com/uploads/files/37115346855.pdf
    • https://samajsutra.com/userfiles/files/54116282489.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/gogapu.pdf
    • http://geoman.cz/data/file/bobibowufiseketujiw.pdf
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/gamarubinelebibaguvazul.pdf
    • http://audiohrestomatiya.ru/content/file/18883931825.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416f39cc299---jazevulelaxobowuwumef.pdf
    • http://yameitecl.com/ckfinder/userfiles/files/20210904_031048.pdf
    • http://strelnicebudejovice.cz/userfiles/file/toxigutelunaf.pdf
    • http://theartofdesign.nl/ckfinder/userfiles/files/91335117870.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_off0000bce5.bin
4f012c2c2512ac8603ed81419de3087d660e73992c3c4fe8fd98b4a19200f348		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE5 11180 bytes
font_01_sfnt_off0000d654.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 16792 bytes
font_02_sfnt_off0000ee66.bin
4f45cd3e02708f7deeef9459c3a011870ab6b642f54cb3f0a6cd07a8bf45c7cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 16660 bytes

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