Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75e4ac2f7ac82c4…

MALICIOUS

PDF

78.2 KB Created: 2021-05-03 04:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c246f52fa4e4a9bc092fcf8b2fe63d6d SHA-1: 79c7b5aea359c410de9ea0b2ae160f4273fbc1c9 SHA-256: c75e4ac2f7ac82c4b42dbed747236bc1546b097dc427ff4db9c8a66594c28a96
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to redirect users to external sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution vector.

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://leonvi.ru/strik?utm_term=how+to+watch+nfl+sunday+ticket+for+free
    • http://fofumumitem.medianewsonline.com/christmas_songs_satb.pdf
    • https://xujikipige.weebly.com/uploads/1/3/1/3/131379844/pajuda_bozesizuma.pdf
    • http://penexej.mywebcommunity.org/1702675558.pdf
    • http://gemosugobez.22web.org/swing_trading_dummies.pdf
    • https://rabofabi.weebly.com/uploads/1/3/0/8/130813834/a3a3c7127f82c32.pdf
    • https://cdn.sqhk.co/fedovipawe/h8sYgA5/create_your_own_music_games_online.pdf
    • https://wiselorasen.weebly.com/uploads/1/3/0/7/130739143/8122931.pdf
    • http://zudezipebij.22web.org/vivifejizapaxubibegadosu.pdf
    • https://cdn.sqhk.co/mapexuze/heihidm/vivatimusufu.pdf
    • https://xovonugobo.weebly.com/uploads/1/3/4/6/134688771/1604791.pdf
    • https://cdn.sqhk.co/xemuxebu/jhz6kg7/cheat_lightning_fighter_2_mod_apk.pdf
    • http://rekijiwowak.scienceontheweb.net/90427478709.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kolenexe.epizy.com/3329726301.pdf
    • http://kudawugijamino.rf.gd/how_to_fix_hunter_douglas_cordless_blinds_that_wont_go_up.pdf
    • http://vaxomuterok.epizy.com/35311049055.pdf
    • https://s3.amazonaws.com/matogapibelifiv/36549072719.pdf
    • https://uploads.strikinglycdn.com/files/87bfacb2-8f03-4508-bde6-5d8ebfcc3d9e/75086705114.pdf
    • https://s3.amazonaws.com/piwanisaj/9388406165.pdf
    • https://s3.amazonaws.com/jarawaxanivu/gazakavetimat.pdf
    • https://uploads.strikinglycdn.com/files/0e5400ed-4c39-443f-897b-9ae41206fa5f/learn_angularjs_2_step_by_step.pdf
    • https://uploads.strikinglycdn.com/files/6d955206-229d-4f90-8329-edf21b609a5f/jvc_kd-s39_car_stereo.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_off0000f341.bin
9c460cc9ebcb3c31b5ddaa53c9abee3e3ba0ecd3bcf2c993a9d3485436f3196a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 5328 bytes
font_01_sfnt_off00010574.bin
6c9ca2e1dfdc9e1c5e8962b22e04a313412c196e0c2841d3358a48dfd9db40da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 11256 bytes

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