Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8c68691a87d557…

MALICIOUS

PDF

80.8 KB Created: 2021-04-06 12:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61868c99c7a8a6eb11e199f35cff5983 SHA-1: fd6bc369435e4bdc6f164d8576688384e9ced9e7 SHA-256: ff8c68691a87d557bd6285c83c62fde14d58e659314ce4c674789b38ce10bc94
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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://jottigo.ru/123?utm_term=fibre+sheet+design
    • http://xewodatesuporob.mypressonline.com/65274765873.pdf
    • http://in-step.shop/dutefidetevezurxchwi.pdf
    • https://cdn.sqhk.co/fekolisuzub/jbwclk4/nipoxobobone.pdf
    • https://cdn-cms.f-static.net/uploads/4474223/normal_605fa5fc34aeb.pdf
    • https://cdn-cms.f-static.net/uploads/4407997/normal_604e6ab844aab.pdf
    • http://berkeciftci.net/catskill_daily_mail_obituary_archivespf39k.pdf
    • https://cdn.sqhk.co/baxotonad/hdKidQq/13329313240.pdf
    • http://pililiriniru.mypressonline.com/duwolasisewowowawuper.pdf
    • https://cdn-cms.f-static.net/uploads/4503533/normal_602a4708cfc3c.pdf
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5fd624b469da5.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • https://cdn.sqhk.co/mudonisogub/hhjhhhd/immortal_raid_shadow_legends.pdf
    • https://static.s123-cdn-static.com/uploads/4390383/normal_600458f40b8bd.pdf
    • https://cdn.sqhk.co/jokutevek/wjeOOvJ/kenatazupuvodisuzobe.pdf
    • http://scriptbook.xyz/call_recorder_free_appsyj8dg.pdf
    • https://static.s123-cdn-static.com/uploads/4415309/normal_60016dc7d5a34.pdf
    • https://cdn-cms.f-static.net/uploads/4481272/normal_6013a44fe2cc4.pdf
    • http://demask.space/wetibezupoweped9odm7.pdf
    • http://kikababono.mywebcommunity.org/22474003434.pdf
    • https://cdn.sqhk.co/vomoxixeri/fgijjBW/long_day_closes_parents_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ac778a65-2090-4105-a13e-2485d55d89d6/how_do_i_get_my_verizon_fios_remote_to_control_my_tv_volume.pdf
    • https://uploads.strikinglycdn.com/files/af761f6f-c90d-47b3-ad88-6706cedb61c3/probability_book_online.pdf
    • https://uploads.strikinglycdn.com/files/0327ec3b-0572-4522-9ea0-4a527ef7a9bd/how_to_program_spectrum_remote_to_tv_codes.pdf
    • https://uploads.strikinglycdn.com/files/0d35feb2-da92-4d8f-afc9-b86e77e1c076/eleanor__park_quotes.pdf
    • https://uploads.strikinglycdn.com/files/454ec61a-0ac3-4f4d-8ec9-25db51bfc968/how_long_to_smoke_a_12_lb_turkey_in_electric_smoker.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_off0000ed73.bin
d01eac9cf92f24dfc7f2ac7c3414938bc6f47bb3364a36c7208de00500aae5ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 4940 bytes
font_01_sfnt_off0000fe38.bin
3144ceef2d25063dcf54cfe543893ad2ff829db054c83fd06b2f5479662cba6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 9948 bytes
font_02_sfnt_off00012040.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 16164 bytes

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