Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f01a0aaffcb0bc…

MALICIOUS

PDF

91.5 KB Created: 2021-03-12 08:13:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13bfe90b91282113225d154ebc901f65 SHA-1: 2fb898f6102211e412c26c45e1f65df2e5c0e111 SHA-256: 60f01a0aaffcb0bc2bea6f4c35ad11fa51c9f94976096e31d35b8fdd933bf857
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a strategy of using numerous links on low-reputation hosting to obscure malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/wix?keyword=spotify+offline+free+apk
    • http://obzorov.site/astor_piazzolla_oblivion_sheet_music_freerdgbt.pdf
    • https://static.s123-cdn-static.com/uploads/4385412/normal_5feb7453d1b55.pdf
    • http://chunyoo.com/76944320117qckpb.pdf
    • http://fesilibokedej.iblogger.org/31762685926.pdf
    • http://fisutef.iblogger.org/tanewidoju.pdf
    • https://static.s123-cdn-static.com/uploads/4526930/normal_5ff521fbed034.pdf
    • http://gojawufeki.getenjoyment.net/30773688141.pdf
    • https://cdn.sqhk.co/ponesigis/aAgieSB/zolizif.pdf
    • http://carinsusa.info/moral_hazard_report_meanschmsw.pdf
    • http://taygerr.com/john_deere_snowblower_attachment_installationxv7hn.pdf
    • http://zizodoroluxonaf.sportsontheweb.net/nasupomuwafil.pdf
    • https://cdn.sqhk.co/defegitip/idRmjjB/nirejenixi.pdf
    • http://kanaxade.mygamesonline.org/how_to_determine_property_boundary_lines.pdf
    • http://xufamorazogubov.sportsontheweb.net/ribinejotu.pdf
    • http://wabesiguz.22web.org/how_to_replace_lid_switch_on_kenmore_stackable_washer.pdf
    • https://cdn-cms.f-static.net/uploads/4379487/normal_60395cf72215a.pdf
    • http://meetsalle.xyz/5e_phb_freebria2.pdf
    • http://tur8osale.site/the_selection_series_kiera_cass5ypb6.pdf
    • https://static.s123-cdn-static.com/uploads/4479254/normal_5ffcb7c1bc028.pdf
    • http://amorexpo.com/43354821205zsigy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lojetewope.epizy.com/venom_logo_wallpaper_android.pdf
    • http://wirijabi.rf.gd/81711831688.pdf
    • http://resilasijajatil.myartsonline.com/53379732548.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://scripts.sil.org/OFL
    • 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_off00011133.bin
4b77b8504a5fcf79118f5591951ad6f0fbbdc900503e25bb1ae137bc18b90015		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 4984 bytes
font_01_sfnt_off00012244.bin
6aa50509bfa51d059dd7887506b02b257c26678645fdc512181cd93eb672f71e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12244 13676 bytes
font_02_sfnt_off00014ac8.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC8 16312 bytes

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