Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee0ec0c94e91151…

MALICIOUS

PDF

89.2 KB Created: 2021-09-17 09:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ade2b65de1cef6cbc3a00ba4a02c39b SHA-1: 45a16f11cee1e88401dbb44f29b2801c2f94116a SHA-256: 3ee0ec0c94e91151c44bd6c74f9f1b41a08c8564bdacbe67162791cae604ee37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using numerous distinct hosts with few links per host, a common tactic for evading detection. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest the PDF is intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=video+chat+similar+to+omegle
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614119e74aa9b---fivusefog.pdf
    • http://sten.kr/club/data/userfiles/file/20210910063435.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dcd308c17e8a3c098d4a46914af82bbd/pogoxelotojufonagoba.pdf
    • http://abwpetersburg.com/uploads/files/74647855303.pdf
    • http://skinct.com/upload_file/file/Fl202109111258109583.pdf
    • https://weborder.cloud/userfiles/file///90077392089.pdf
    • https://infoenergie-loire.org/userfiles/file/82181290935.pdf
    • https://cgeminfos.ma/upload/file/niparilatuginibikonusewe.pdf
    • http://danchrisjewelry.com/userfiles/file/7611953401.pdf
    • http://ajisushionline.com/uploads/files/7190436732.pdf
    • https://mimpishio.com/contents/files/gegilolibilojom.pdf
    • https://vietrocknet.org/app/webroot/img/files/36638982354.pdf
    • http://infoegrafica.com/userfiles/files/45094218656.pdf
    • https://srsatta.com/ckfinder/userfiles/files/91198193847.pdf
    • http://orderleesushi.com/uploads/files/jesujirakinexex.pdf
    • http://quangcaosmsgiare.com/media/ftp/file/ninupowe.pdf
    • https://detector-billetes.com/Imagenes/file/dibebiju.pdf
    • http://davcpundri.com/css/file/kidexe.pdf
    • http://savvyais.com/userfiles/file/gaxerononifa.pdf
    • http://icoenergia.com/userfiles/files/dezaniloxa.pdf
    • http://suarezbeltran.com/aym_images/files/putopilolaja.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_off0000f84f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 16792 bytes
font_01_sfnt_off00011061.bin
652a04430f2fc660bb9cec22b2dbd6305bc4bde23b4464f22c0b517f7328cb9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 17912 bytes
font_02_sfnt_off00013f0b.bin
b5e33530690ff5567003b3afabd464a018c44e6d58ce249525ef9de82553713c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0B 10684 bytes

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