Malicious PDF — malware analysis report

Static analysis result for SHA-256 253e06293addeb45…

MALICIOUS

PDF

86.7 KB Created: 2021-09-15 19:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd074c7493cf65a6d9bf076498fa3b2d SHA-1: 8c8e5c0280964d6632e5c0875534d275176cdf81 SHA-256: 253e06293addeb4537a12f8243a1c2e8fdcb6560c2f582d694e9208912c2f87f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://laborke.ru/uplcv?utm_term=games+like+gta+5+on+android
    • http://columb-sklep.pl/userfiles/file/wefajonijugawaxi.pdf
    • https://raljob.com/userfiles/file/84182304955.pdf
    • https://pensiuneaselina.ro/userfiles/file/38983530478.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137489c88e50---82270162151.pdf
    • http://hockeydh.com/files/ups/files/45334585932.pdf
    • http://xahscw.com/userfiles/file/gefafuduwasisaguwara.pdf
    • http://jobsandhi.com/uploaded_files/userfiles/files/tirevof.pdf
    • http://blueleaves.ru/userfiles/file/4088668624.pdf
    • http://studioassociatoemc.com/userfiles/files/13249564950.pdf
    • http://commsoft.nu/demo/ktb/wsmbilder/files/55398787975.pdf
    • http://travelport.pl/userfiles/file/wezilajafodekujugak.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613567a2a3c16---redov.pdf
    • http://acsalma.hu/userfiles/files/pejewogulavuguzivapedon.pdf
    • http://marketingnews.fr/images/file/10053525869.pdf
    • http://irinaburmistrova.ru/files/14779257920.pdf
    • https://vico-real-estate.com/ckfinder/userfiles/files/49769126136.pdf
    • http://godsownproperties.com/userfiles/file/zibuvetikulavol.pdf
    • https://westhygiene.hu/editor_up/migamutupuwu.pdf
    • http://liyangah.com/Upload/file/45778761718.pdf
    • http://kurier48.pl/files/userfiles/file/bawam.pdf
    • http://villahetzwartepaard.nl/survey/userfiles/files/zemavar.pdf
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/18411750278.pdf
    • https://littleedupark.com/ckfinder/userfiles/files/gadusat.pdf
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/20599692420.pdf
    • http://doremimarlikinsaat.com/userfiles/file/10623180348.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_off0000f06e.bin
291e9fd1acec6b42608898ff63f7b9e53d549f6b2dab1bd8606a117595d04ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 16892 bytes
font_01_sfnt_off00011bfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 16792 bytes
font_02_sfnt_off00013415.bin
c4cc1a45e1043652252b580eaf21facbe22f8411f0f6330bddbfd04e7a561c71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13415 10856 bytes

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