Malicious PDF — malware analysis report

Static analysis result for SHA-256 248f7be96e8238c7…

MALICIOUS

PDF

76.3 KB Created: 2021-03-16 21:10:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eb5d6e353c336fb668c32e8389a10e8 SHA-1: 2efc46ccc746a82025da40376dcec836077c49a9 SHA-256: 248f7be96e8238c7e2757d5afd0e83c8aff6196956b83005c54f4de51e53beb8
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, indicating it functions as a link farm. This is a common technique used to distribute malware or conduct phishing attacks by directing users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, and the presence of embedded URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-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://jumiwimov.ru/strik?utm_term=what+is+measurement+control+system+in+electrical
    • https://jowatewiko.weebly.com/uploads/1/3/1/3/131380225/viwijur.pdf
    • http://xadixul.66ghz.com/journey_to_the_west_1_movie_download_in_hindi_480p.pdf
    • https://static.s123-cdn-static.com/uploads/4483082/normal_600279dcad5d9.pdf
    • https://weneboremuneje.weebly.com/uploads/1/3/5/3/135317625/bd4f2df.pdf
    • https://static.s123-cdn-static.com/uploads/4481516/normal_60026a66c6a0d.pdf
    • https://dufofumiwiz.weebly.com/uploads/1/3/5/3/135309849/fc047ac.pdf
    • https://static.s123-cdn-static.com/uploads/4369163/normal_5fef0b1e79de9.pdf
    • https://novomegaweg.weebly.com/uploads/1/3/4/7/134738931/musesoboganaze.pdf
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/letawizotopebusedu.pdf
    • https://rufeguduti.weebly.com/uploads/1/3/1/3/131384240/nunobujo-muvutujelokemi.pdf
    • https://cdn-cms.f-static.net/uploads/4488592/normal_6033799fa9f67.pdf
    • https://volejodanuba.weebly.com/uploads/1/3/4/5/134593723/xesigi_ripuxitugoda_letumawiz.pdf
    • https://cdn-cms.f-static.net/uploads/4487416/normal_60315fd2e7816.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rubidokezive/definite_and_zero_articles_exercises.pdf
    • http://repatigidan.rf.gd/giwimidokogaziwigo.pdf
    • https://s3.amazonaws.com/muxegeza/2018_best_sci_fi_adventure_movies.pdf
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_93c2882f9c7847a7b4f1265a5b11aeb8.pdf?index=true
    • http://fepavipa.epizy.com/xozigevoxudekugew.pdf
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_c2c2ce8e2ffd4c81ab9d782dcc3d3e2f.pdf?index=true
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_38e1abf5256e457ebe1bf5bd581ca9d3.pdf?index=true
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_26e476f7b432426397253afd51e08241.pdf?index=true
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_01eb268d3d26460abb954c83ae17bc82.pdf?index=true
    • https://s3.amazonaws.com/metubevozisul/jvc_compact_vhs_camcorder_instructions_manual.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_off0000eb33.bin
7fb0a3078ad790f81a1721359ade4cb9aef68c083d2b7cbae1fe036a21cf884a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 5156 bytes
font_01_sfnt_off0000fca2.bin
f20d30dc117e368464942eff50049f07e0a5114ba84fbcaa6e62d774799476be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 11696 bytes

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