Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee4079b8e40801a…

MALICIOUS

PDF

79.8 KB Created: 2021-03-29 10:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46fbd6f4d9aaac0f8303fe6cb428c363 SHA-1: 68c7fff791ed5eaca049f7a25769fc1cbafe1144 SHA-256: 2ee4079b8e40801a8b5126a5f5d8e0802e7220cf785d89788c74310350392a7f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, many of which are likely part of a link farm. The primary external URI points to a domain associated with a lure for editing PDF text and images, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and the presence of external links strongly suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=edit+pdf+text+and+images+free+download
    • https://static.s123-cdn-static.com/uploads/4390324/normal_600953a47ece6.pdf
    • https://cdn-cms.f-static.net/uploads/4486778/normal_6051e8be4c8ca.pdf
    • http://kusafomidufe.mywebcommunity.org/horario_bus_malaga_algeciras.pdf
    • https://cdn-cms.f-static.net/uploads/4481820/normal_6051384f8c78f.pdf
    • https://lutilizifaguno.weebly.com/uploads/1/3/5/3/135316604/nudavo.pdf
    • https://cdn-cms.f-static.net/uploads/4498330/normal_6037228b5fa17.pdf
    • http://bafiselavanebep.mywebcommunity.org/gapevotijawoxosonenapamaw.pdf
    • https://devegiwosoti.weebly.com/uploads/1/3/4/5/134592662/zokugugoresa-mavilikinuzuv-gitekag.pdf
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/8213042.pdf
    • https://cdn-cms.f-static.net/uploads/4486997/normal_6031eca45dc80.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/41bf4fc6-8655-4835-b0a6-8f7d920e0eea/canon_lide_210_price_in_pakistan.pdf
    • https://uploads.strikinglycdn.com/files/2af7dca5-6237-4e64-befb-c4affda064cd/gta_5_premium_online_edition_ps4_cosa_contiene.pdf
    • https://uploads.strikinglycdn.com/files/74dc945a-2153-42a3-9de5-19c5a0739b2b/85367530433.pdf
    • https://uploads.strikinglycdn.com/files/7ab38c1d-472d-4e42-9d87-65e7dd0fb76a/us_motors_1081_pool_motor_start_capacitor.pdf
    • https://uploads.strikinglycdn.com/files/a9bdedb6-4e3b-4a8e-9cd9-74e562b97b5f/wefirubipudib.pdf
    • https://uploads.strikinglycdn.com/files/9913d52a-ddc4-4dab-9748-0a5bb85e16ad/lawepedoke.pdf
    • https://uploads.strikinglycdn.com/files/d5724dbf-ac0f-4dc9-9623-0a3609271f6b/contax_g1_28mm_review.pdf
    • https://uploads.strikinglycdn.com/files/f88849ba-f880-4394-8f65-518923b39a71/software_developer_jobs_in_canada_salary.pdf
    • https://uploads.strikinglycdn.com/files/e095b821-9e67-40c6-8d63-b3abe287aadf/how_much_does_the_tire_flip_180_weight.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faef.bin
5bcd50714e9d349d9fb5cfef2b6450e03761a72cb2755bcc0edf16983c685c2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 5476 bytes
font_01_sfnt_off00010d9a.bin
8a4a399ff0a63781be7091190f6d133f066f731b72418c1d60b584dfd1bf9451		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 10768 bytes

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