Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9960f68c177ff17…

MALICIOUS

PDF

77.8 KB Created: 2021-05-13 08:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6ff05945d6b04a596e10df2aae0feb8a SHA-1: 2a3ba78236313fe03e15cc802ea0224a8fa6c97b SHA-256: c9960f68c177ff1705c9fa71f58e947e8e2f9d92f2cc8115379f8ee21f1d19db
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, and includes a suspicious URL that is likely part of a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm.

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://soxebez.ru/strik?utm_term=ap+human+geography+classroom PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378155/normal_6018bbcbbe863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483338/normal_600e5cd0e31e2.pdfIn PDF document text
    • http://segovozeperi.22web.org/7783117133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488322/normal_600c94952a9bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417656/normal_5ffc147da5d50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456121/normal_5fe741a837e7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc16044-3d09-4550-bd01-a7a7a2b5d9f7/secrets_of_mental_math_arthur_benjamin.pdfIn PDF document text
    • http://tudefoka.epizy.com/chup_chup_ke_movie_song_pagalworld.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_18bf0350ac084c4d94457015c04d515d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8365cc1d-448d-42ee-b1c2-f683ef6f26e3/97353027014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98c77c7-c879-449d-9697-6164775db7b3/bumebimutudexuxugad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1a78df-ef65-4cad-bd1a-b4410eaf0259/ford_4500_industrial_backhoe_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3bab555-297f-4ecf-8a87-b2334726883a/jukonubuladujusu.pdfIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_1dd9a72f712d4e458382b381a45e4c80.pdf?index=trueIn PDF document text
    • http://darotevu.rf.gd/1435569941.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/notifier_smoke_detector_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/libro_phillips_materiales_dentales.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_eaa7b7868e154b3ea63f84394d0e4b84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/gunrunning_business_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/11396235989.pdfIn PDF document text
    • http://levaduru.epizy.com/sumuxebubagexi.pdfIn PDF document text
    • http://misosemarimo.rf.gd/81343038401.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_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 5440 bytes
SHA-256: 4b8c14b4406b9604cdd81c57a5d37d69b0c4597570938e5dfa87edbe52917a0e
font_01_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 10692 bytes
SHA-256: e2443189d13bab3fb47b4e2a97567776de8fefb4b65fc44a34d4d86481036a18