Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3af5d915f30f1b…

MALICIOUS

PDF

70.8 KB Created: 2021-10-02 21:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09010fbd6f186f18869adcb3bd1c2b0b SHA-1: 95dd259bd51f677b65c36107821e5e2932fd1629 SHA-256: ac3af5d915f30f1b38b604d37bcdd6ad84421ca8af819bd79b4c692e0fa9413f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct, potentially disposable domains. While no scripts were directly extracted, the PDF structure and the nature of the embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or scam purposes.

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://dgssu.com/upfolder/e/files/20210929070054.pdf
    • http://fpempresa.cen.es/userfiles/files/dawefivizetirateju.pdf
    • http://indigobaby.eu/upload/files/sodimifaxawo.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/53218450498.pdf
    • https://signos.larrialdiak.es/files/galeria/files/bukomisokar.pdf
    • https://softnettechno.com/sribati/editor/uploadfiles/96379756698.pdf
    • http://egitara.com/upfiles/files/mukuxuti.pdf
    • http://navigator-nsk.ru/userfiles/file/20127500758.pdf
    • https://khonggiansangtao.com/platformecom/img/upload/file/ritudoruwinirirone.pdf
    • http://kelvista.lt/images/files/pipaporaxonanubela.pdf
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/towutetuk.pdf
    • http://yeosingol.com/FileData/ckfinder/files/20210902_9A2FF159D9D8A085.pdf
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/2359186608.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4a05ce6d46339fbebe44408139d8499e/12147312215.pdf
    • http://snft.ro/media/file/rovevurobilagegitizaji.pdf
    • http://pappteam.hu/userfiles/file/61390591353.pdf
    • https://lacaune.hu/userfiles/file/mupokisumugixanujul.pdf
    • http://dirpub.org/editor/ckfinder/userfiles/files/fisokepatijodebefufeli.pdf
    • http://poultech.net/d/files/bomukedo.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/lezutubosota.pdf
    • https://cmottaviproductive.it/uploads/file/1797734798.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd6958d50b---14030301706.pdf
    • http://gonganmi.com/userfiles/file/sogufubepiwimofiwizefu.pdf
    • http://voszveszprem.hu/_user/file/lekovatab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=disservice+in+a+sentence
    • 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_off0000b387.bin
590fe7ce6406c20720d1165cbeac70828a51a69c2138561febc32ba97a01da55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 16916 bytes
font_01_sfnt_off0000dedd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDD 16792 bytes
font_02_sfnt_off0000f6f4.bin
9a6a45aae36083251af12cb4662a4c8fdf0553decf86841c58934d8dd2d92fa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 10124 bytes

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