Malicious PDF — malware analysis report

Static analysis result for SHA-256 387288ab2dab0b70…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 13:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9cf4ca83f99f7644ec7d63c72540584 SHA-1: 0d044d00e8c68a2b9879fc3dc645c8446c033ec4 SHA-256: 387288ab2dab0b7095cc123836ab9f5cd8d2bd3402425a72a19f55475f7ce037
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oralrem.kz/ckfinder/userfiles/files/rodexonubotegukabo.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/04c2612abd3e42fd5c33f6835c2d57e3/37765656309.pdf
    • https://didacostruzioni.it/userfiles/file/fuwanozutaxewukovenexi.pdf
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/18456492454.pdf
    • https://ldoris.com/upfile/files/20210908182741.pdf
    • http://aaykpn.com/uploads/editor/files/19623707284.pdf
    • https://suruburi.net/mm/file/ruxuxogov.pdf
    • http://peterpan1996.it/userfiles/files/teregozizavupavetujiz.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/57221322241.pdf
    • https://zhavezbozi.cz/data/file/kadukasaxuziji.pdf
    • http://ideatity.com/ckfinder/userfiles/files/dawesanuzakaxefexipe.pdf
    • https://adci.vn/data/upload/file/17797365244.pdf
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/78890290477.pdf
    • http://wsospice.org/uploads/userfiles/file/file/kitanorizakazavisepirexov.pdf
    • http://88cpap.com/userfiles/files/1204947175.pdf
    • https://peusch.lu/userfiles/files/897108025.pdf
    • https://intekcanada.com/ckfinder/userfiles/files/61171578483.pdf
    • http://kunas.lt/app/webroot/uploads/files/pefova.pdf
    • http://hud101.vn/webroot/img/posts/files/20219018318.pdf
    • https://akproauto.com/nbloom/fckuploads/file/gotikefagubixebetuwevali.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614194615e916---lozuwanugefakikeba.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=poparazzi+android+release+date
    • 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_off0000af3a.bin
0e2031ce7db2708f76f037f0192e3679ade6701be0c94c1d83fd3e3e68ec9bbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3A 14864 bytes
font_01_sfnt_off0000d48f.bin
9784eae907b509a106c7ee982ce6442841ed33f9232c7079009a70456991560b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 10444 bytes
font_02_sfnt_off0000ec6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 16792 bytes

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