Malicious PDF — malware analysis report

Static analysis result for SHA-256 a121ae4ce2eda6df…

MALICIOUS

PDF

70.4 KB Created: 2020-12-28 05:09:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9e907e643d76db175bf72a4de781689 SHA-1: 12e306564ab5fda345d629f894bd6bce03bc34ad SHA-256: a121ae4ce2eda6df07e16cce293636980a1e4ea0a774795b8a08221f7ce7cf85
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

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://trafffi.ru/123?utm_term=practical+arts+vocational
    • https://lerofiputa.weebly.com/uploads/1/3/4/3/134367001/2796393.pdf
    • https://jafadunew.weebly.com/uploads/1/3/4/6/134632108/pumop.pdf
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/duvokidadiv.pdf
    • https://cdn.sqhk.co/lapefuxolu/icgchbf/avatar_gaming_logo_maker_free.pdf
    • https://besajiti.weebly.com/uploads/1/3/1/8/131856076/5665386.pdf
    • https://vigojipawus.weebly.com/uploads/1/3/2/6/132695212/20f319290cafb0b.pdf
    • https://cdn-cms.f-static.net/uploads/4450042/normal_5fd2c51bc7d75.pdf
    • https://cdn.sqhk.co/vizinifum/afmiihi/30183911317.pdf
    • https://cdn-cms.f-static.net/uploads/4394066/normal_5fdc20ee66664.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vibasujefir/32718638057.pdf
    • https://s3.amazonaws.com/penefelomiju/66561395553.pdf
    • https://s3.amazonaws.com/sixenogafopoj/proform_pro_2000_service_manual.pdf
    • https://s3.amazonaws.com/pegozegi/sasevuri.pdf
    • https://s3.amazonaws.com/bidurudilidujug/the_story_of_rama_and_sita_bbc.pdf
    • https://s3.amazonaws.com/nilititonawafim/zubofe.pdf
    • https://uploads.strikinglycdn.com/files/66dea8d5-5e7a-47c0-b88b-3af490459232/76671955950.pdf
    • https://s3.amazonaws.com/vinejivunitego/kenifovanevugajoza.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_off0000d8eb.bin
6286c691d780e7b000f85469df9751c2e356e862158998186d94b414670f504c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 4856 bytes
font_01_sfnt_off0000e97d.bin
87dd5e5401f20b8a8ab7576ac5b09e71239975b7b1f2cffd30cc29b13e56f643
pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 10276 bytes