Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10022df74955a24…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 17:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ee5d2a1be3718311e8f478006995c96 SHA-1: 0d7b6f856d9a4ca57ef5d76ff8de66aaca9e6311 SHA-256: a10022df74955a24e98e394fb14b204542de6dc1b00cc582094cc99cb2edc706
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains, with one heuristic specifically identifying it as a 'link farm on disposable hosting'. This suggests the PDF is used to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/011625267080.pdf
    • https://zenithoverseas.com/assets/userfiles/files/82690679950.pdf
    • http://sbstroy53.ru/img/files/8835190092.pdf
    • http://congtrinhnhaviet.vn/upload/files/67165863848.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f893ea3c45ebe2fd6e4000bee1b77916/39295531618.pdf
    • https://lentes123.com/aym_image/files/disox.pdf
    • http://autoklej.pl/app/webroot/media/files/gibezumisupokumu.pdf
    • http://deaprogettazioni.it/userfiles/files/zotobakagadowoxikasobira.pdf
    • http://tungalag.mn/userfiles/files/jerevijusojoxakinidoval.pdf
    • https://onwater.my/uploads/file/90502764036.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/30401629321.pdf
    • http://sns.hu/_user/file/kenerilezew.pdf
    • http://penzion-u-zamku.cz/files/file/gopugeju.pdf
    • http://tamker.hu/userfiles/file/84540194716.pdf
    • http://www.alcera.ca/userfiles/file/1031476233.pdf
    • http://jowinbio.com/upload/files/202109130503582282.pdf
    • http://shiny-baby.com/fileimage/file/mujuwikozidetufuwit.pdf
    • http://danchrisjewelry.com/userfiles/file/42142388151.pdf
    • http://stainless-faucet.com/uploads/htmlupload/files/33324362414.pdf
    • https://tgvl.in/uploads/fck/files/botope.pdf
    • http://peneleos.pl/userfiles/file/27809766388.pdf
    • http://vuonlan.vn/data/upload/files/28512229813.pdf
    • https://deshpanday.com/ckfinder/userfiles/files/vuwivalakepemezo.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141cb9765646---47463435109.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=la+vida+es+bella+libro+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_off0000e111.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 16792 bytes
font_01_sfnt_off0000f928.bin
5de77cc4f63970c2c313dc487f89b7b48d4ef84adf48b2237c0a1a3c4deb7f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 10452 bytes
font_02_sfnt_off000110b2.bin
5bd11af6ec5ff6455b2f438f1c34526c92743f33deca3116336b26632832b233		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 20668 bytes

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