Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c0bde73902f022…

MALICIOUS

PDF

78.7 KB Created: 2021-03-03 17:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 784a63aea1d1bd58a9a9e4180d28e9f4 SHA-1: 8b718b143b1e37cd5e0f01a14dd8641c8985c06c SHA-256: a2c0bde73902f0224a23fd4260d3ad589ad49be751b4132f90fb2f410618700a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/123?utm_term=washington+state+women%2527s+basketball+stats PDF link annotation
    • http://bumumapa.mypressonline.com/organic_chemistry_class_11_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/OAjghjG/mahjong_village_help.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/uLxgeA7/nails_ideas_short.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5fd17dff575f7.pdfIn PDF document text
    • https://nukarefu.weebly.com/uploads/1/3/4/1/134131348/1006468.pdfIn PDF document text
    • http://viputixezererej.66ghz.com/boson_engineering_datasheet.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/4478687528.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/bijamilaponumuw.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/egeia8U/cubesat_gravity_gradient_boom.pdfIn PDF document text
    • https://fijuzezakuxulow.weebly.com/uploads/1/3/5/3/135391315/basokuxekovupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/kindle_d01100_manual.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/sipuburumep.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 5348 bytes
SHA-256: df9d6f5a0ff1327ae95728fff6c9fd77a7e95fc9a36f57ce9a49bc56061ff2b2
font_01_sfnt_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 10156 bytes
SHA-256: 83878dbf0f22375fdf2a13832a8cb733146d686da6c08532b8a51e9004610cd6
font_02_sfnt_off00010c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9A 19520 bytes
SHA-256: d0d76a4f7d114710476249bf2aa69bd98f15a8119bfe6c714e369b6336ab1dc1

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