Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18050ca82f75e1d…

MALICIOUS

PDF

74.4 KB Created: 2021-04-25 04:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d67e85f16200b525dbcee3346e796ab SHA-1: 7db099308c4ca4590b28962da6158c42c3349fa8 SHA-256: b18050ca82f75e1d0247e2f9be42bbb4c0752098fa2625b2e0db82c39f4d3bb7
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed a significant number of embedded external links, suggesting a link farm or phishing campaign. The presence of multiple URLs, including those on disposable hosting, points towards an attempt to redirect users to potentially harmful content or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pelibifir.ru/strik?utm_term=tafuri+architecture+and+utopia
    • http://bifakibebus.iblogger.org/slumbering_weald_guide.pdf
    • https://dovasivenumi.weebly.com/uploads/1/3/5/9/135965427/103de4e80e960.pdf
    • https://dewubixire.weebly.com/uploads/1/3/1/3/131398231/mupikiwuwal-nubogidozomo-jakamopes-didifawepomu.pdf
    • http://nuraner.iblogger.org/define_chief_information_officer.pdf
    • http://sodamasagu.66ghz.com/jomototevoj.pdf
    • http://fixebojamofi.iblogger.org/how_to_adjust_time_seiko_automatic_watch.pdf
    • https://tinutenuku.weebly.com/uploads/1/3/4/6/134664278/witixixexisuw-dimiwuzip-nenitevasubovi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_64db042cd2c44f82ba565126918c8067.pdf?index=true
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_c3ba716887e24d5786a5f66b817223de.pdf?index=true
    • http://zowujobosega.rf.gd/zofujaditozogezujotitasuz.pdf
    • http://midabufab.rf.gd/rarixona.pdf
    • http://jimogorop.rf.gd/ratusowepixep.pdf
    • http://gubodasitonobu.epizy.com/xizifuzolepumuxof.pdf
    • https://uploads.strikinglycdn.com/files/bae51dbf-90ab-46cd-a52a-3bef08f5b83f/diffusion_of_innovation_rogers_5th_edition.pdf
    • https://uploads.strikinglycdn.com/files/4d2a4dec-a900-4628-8fe5-226ac1599735/23898210878.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_off0000e31e.bin
726d649cf7edafb97f17b44f6824826f317c128c48bc48f269fd5c138e60549f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 4980 bytes
font_01_sfnt_off0000f40b.bin
90c261011f9f84b94b843c8681ef1eb62506b07f9701c1450dbbcc99ed18dad5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 12084 bytes

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