Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f009c623c961c25…

MALICIOUS

PDF

83.0 KB Created: 2021-04-03 18:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6946316cfe49cad974a8f5e6ecbe6e3 SHA-1: 9bfefaf1e58e709a46612d73a2954273c9286cbc SHA-256: 6f009c623c961c25004aeb48eb54ef85e147f9b5ded1179639d14e980196660f
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting and is flagged by ML classifiers and ClamAV as malicious. The embedded URL `https://vilenefex.ru/123?utm_term=many+lives+many+masters+book+report` is likely the primary payload delivery mechanism. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated by a tool and potentially used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/123?utm_term=many+lives+many+masters+book+report
    • https://cdn-cms.f-static.net/uploads/4476930/normal_60432899dea92.pdf
    • http://opensalle.xyz/if_mark_batterson_discussion_questionspzwev.pdf
    • http://forsage.pw/jilewasaguzagosezu2lb8i.pdf
    • https://rofunepez.weebly.com/uploads/1/3/2/7/132710772/laxavam_sudomabamutoku_rexidelaze_wazesazejusapel.pdf
    • https://nuxelimifa.weebly.com/uploads/1/3/0/7/130776070/1590cae.pdf
    • http://derifupiwa.mypressonline.com/aneurisma_cerebral_pediatria.pdf
    • https://cdn-cms.f-static.net/uploads/4501204/normal_600f4dccae690.pdf
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/2706659.pdf
    • http://helpforteam.com/munanalavejugesawiwoguxeikrrp.pdf
    • http://kekewawoxugar.sportsontheweb.net/700442590.pdf
    • https://cdn-cms.f-static.net/uploads/4493905/normal_6045e7660fc39.pdf
    • https://cdn-cms.f-static.net/uploads/4392861/normal_5fda083c18b81.pdf
    • https://wajabanafeku.weebly.com/uploads/1/3/4/5/134599300/sebekefukogezi.pdf
    • http://netzamka.ru/pujakqiy62.pdf
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/9743781.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d324e40c-df7f-4dfc-93d9-496d3f6708df/universal_audio_apollo_twin_duo_thunderbolt_3.pdf
    • https://uploads.strikinglycdn.com/files/f33c6e5c-7df4-4e41-a922-fad4d8e39104/how_to_fix_my_wahl_clippers.pdf
    • https://s3.amazonaws.com/dovulavavo/sheet_extrusion_machine_hs_code.pdf
    • http://sitafefisoju.atwebpages.com/fazudulutemod.pdf
    • https://s3.amazonaws.com/tevigotu/project_gantt_chart_template_excel.pdf
    • https://s3.amazonaws.com/buponuwebi/scheduled_maintenance_report_definition.pdf
    • https://s3.amazonaws.com/mexesazaxasa/towiroserinega.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f785.bin
370b63e99b3bc2c1d8b7a2bfc1693e0257dccade0e64e814f912f9e1c3af29e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 6548 bytes
font_01_sfnt_off000107db.bin
08bce2233aad98e6a81055964bff9b6bd71279e9daf757be509c557911f4a341		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 5336 bytes
font_02_sfnt_off00011a00.bin
4cb82adeaa5b9643271a70d9ed5fe3b144e4fe93c4a411b701f1b0d8e2695c22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 10608 bytes

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