Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5aeb03028617cc9…

MALICIOUS

PDF

76.2 KB Created: 2021-03-24 22:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2df0760141ae509f4017de9f3d8a1329 SHA-1: 5008481292d2efff9c353b2a7c78210f96226938 SHA-256: f5aeb03028617cc925b983eb902833f3ecb44ec1d564913118e3f0a34c6baba2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains or user-generated content platforms, indicative of a link farm. One of the primary URLs observed is vilenefex.ru, which is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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/wix?keyword=manual+layout+nfe+4.0 PDF link annotation
    • http://xufelaketodo.getenjoyment.net/47481298150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490272/normal_5fe9c562f2aa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_60313dc41a330.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_ff1c441b032c4cfca10d0b343fc323a3.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_57ff75832c384ce1a49539b160a92a6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/617e285f-fb8c-49b0-9e5e-220b4e60814c/what_is_magna_carta_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca59196-843b-4091-81fc-53525c0c5ae7/11606210787.pdfIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_61cd1e73ba1c4c26b29bd0373fc7c042.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef1950b7-7063-440c-ab8a-be9000fc5d1a/37315422254.pdfIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_20dda51455734e52b2eb188bfe9a4508.pdf?index=trueIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_f1b5341bd14b461a9f27636946151113.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_8d0d5dad07ac40aa8b1698648996e989.pdf?index=trueIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_a5e944e5495c4dbd8f50d5f1e31ef711.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_cf0af1c111924413846928699ae23678.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_eba5a882311342ca8a72f6523344fe11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71096088-0bd3-4d9f-8747-567305beebad/bixidalidejubireti.pdfIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_e7dd30001be04a4d9a7fa53251c63022.pdf?index=trueIn PDF document text
    • http://pabotojixupi.atwebpages.com/21091263868.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_ac27975592734533a9be67b500582be5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bdd12a2-28e1-4803-a99b-b5fa85ff26e9/axial_scx10_ii_jeep_wrangler_interior.pdfIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_8b407489fb3a44c194d7a0d6b29863d1.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC05 4688 bytes
SHA-256: a7f988789aadb8a85b2ba473e52a22bd940dc865bf0c782af0a2d7099ace4f4e
font_01_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 12880 bytes
SHA-256: abad0db8413adfe2411d90d5cb530ea342cc459257df04cb3d4df22f682e7325
font_02_sfnt_off00011359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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