Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b2c641cce7a2d1…

MALICIOUS

PDF

80.1 KB Created: 2021-03-14 19:16:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f6d1ebc3fe823d942bad132085325fa SHA-1: dbf6a96aadca1bca8dd08e056228a41d8f8de5f4 SHA-256: c9b2c641cce7a2d1a3f96f168c80a8b8ebc3b958fedc0220933d061b6df56356
186 Risk Score

Malware Insights

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

This PDF file contains a mass of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://jumiwimov.ru/strik, which is likely used to redirect the user to a malicious site. The PDF structure and the presence of numerous external links are indicative of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=big+little+lies+theme+song+season+2
    • https://cdn-cms.f-static.net/uploads/4421342/normal_603ed2bdebaee.pdf
    • http://pejelurim.getenjoyment.net/wutatetijolodibupu.pdf
    • http://xuroriwonufuz.scienceontheweb.net/26854791201.pdf
    • http://lirinevewafa.mypressonline.com/14881317785.pdf
    • http://wedasuf.getenjoyment.net/fugogetefases.pdf
    • https://cdn-cms.f-static.net/uploads/4423431/normal_6032ca7e74461.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_2f25082571964ee0b2490cbc535eb7b3.pdf?index=true
    • http://gikutixutawax.epizy.com/constitucion_mexicana_1857.pdf
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_0b14250791ee411594f05aadc40edb7d.pdf?index=true
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_1b57ac6084f9470b82c57bbf65490dde.pdf?index=true
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_f7b04e15eb3f4d5d888f47e7c0efc53a.pdf?index=true
    • http://lamisegowa.epizy.com/15472382022.pdf
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_fad7b3156fa346bb85134a03a1c7d4b9.pdf?index=true
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_d3b293a6283a4f5d9f1b8212a4934f06.pdf?index=true
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_c1ded0629894476ab3e5bc4eb96f2945.pdf?index=true
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_3f052da68b4949c986eb9c8b0dfa7284.pdf?index=true
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_a0d059f51dce4ec58057cdf382c3fb7f.pdf?index=true
    • http://fabonek.rf.gd/defegebu.pdf
    • http://xivajaraseb.rf.gd/18638651661.pdf
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_3070d906234c4761b02afe7169baacbe.pdf?index=true
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_fd36e8fa43b645e6ba6d525cd6bb22ba.pdf?index=true
    • 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_off0000fadd.bin
2b166a64ea4dcfb1ebbc1b95e97a68dfa99f6b459cda71dc197087067d6812c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 5184 bytes
font_01_sfnt_off00010c5c.bin
8d749bb22c2d49dbb52f1a5361c61ae7ceb5287c5079927322d62a53a5486b8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5C 11488 bytes

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