Malicious PDF — malware analysis report

Static analysis result for SHA-256 614c2daaac33411f…

MALICIOUS

PDF

70.9 KB Created: 2021-06-09 01:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ae44fe4fd1496c2b015e1e905207cc66 SHA-1: 179e44e49621b16f2d1829f873779f5e984e6ef4 SHA-256: 614c2daaac33411fa6ae689b88127bb72e2f91cd8eafb11e0908e472b543f4ab
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'crewmak.ru', suggesting it functions as a phishing lure or a distribution point for further malicious content. The presence of embedded JavaScript, though not fully detailed, further supports the potential for malicious actions like downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/pbw?utm_term=johnny+upgrade+2+cool+math PDF link annotation
    • https://vomefamatufovo.weebly.com/uploads/1/3/4/3/134378522/kiwigat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_60443cc8cdab6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485443/normal_5fdceba4cf2c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443356/normal_6054f72d23508.pdfIn PDF document text
    • https://sejoxamopizava.weebly.com/uploads/1/3/1/8/131858661/babenuxakemupase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_6014b14d4bd31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489407/normal_5fe97764ab9a6.pdfIn PDF document text
    • https://talaxekagaros.weebly.com/uploads/1/3/5/3/135347480/d0a0563088f9.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/suwexumovasebawujobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_60bdcfc819513.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497093/normal_6003336a3039c.pdfIn PDF document text
    • https://walikuroxora.weebly.com/uploads/1/3/2/8/132815001/8434023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370307/normal_5ffc17ca4e3f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_6035cba116995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417535/normal_600093ead7541.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mofarires.pbworks.com/w/file/fetch/144897831/find_the_surface_area_and_volume_of_a_rectangular_prism.pdfIn PDF document text
    • http://niluputevi.pbworks.com/w/file/fetch/144718680/80950689709.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 5532 bytes
SHA-256: 89f53e904003b5bbbd6405efbf38680c1340b5b87bb5cec986f064013c24a35c
font_01_sfnt_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 10784 bytes
SHA-256: 52f9656518bbaed54e60101abc011b8e7968e9eb0936a9951fe81b7d6c9f1e76

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