Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d52b4eb93f6325…

MALICIOUS

PDF

75.1 KB Created: 2021-03-30 02:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c97b495932a8ae92928f607cc9db4523 SHA-1: 9760d41ce5570245517ab634fe6aeaa0bc0ca7e9 SHA-256: f4d52b4eb93f63255475d18f338bbea6d08beef905d0d34fb79bd265c29e125e
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are embedded within the document body and appear to be part of a link farm designed to manipulate search engine results. The primary URL, https://vilenefex.ru/strik?utm_term=canon+pixma+mg3120+wps+setup, suggests a lure related to printer setup, likely to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://vilenefex.ru/strik?utm_term=canon+pixma+mg3120+wps+setup
    • https://cdn.sqhk.co/kowumutajaw/Xhfiejj/kuraguxozubokanebetetipiw.pdf
    • https://cdn.sqhk.co/butemobe/iaqLghl/no_more_crop_tops.pdf
    • https://cdn.sqhk.co/vopofuxo/gOsU6jM/sopufejabipane.pdf
    • https://cdn.sqhk.co/gojaxaxiwa/jfThgjc/pisokumupu.pdf
    • https://cdn.sqhk.co/rufosopufu/bUAX92o/fifa_indoor_soccer_field_dimensions.pdf
    • https://cdn.sqhk.co/rajemaramiw/bSifGB8/hidden_agenda_ps4_game_review.pdf
    • https://cdn.sqhk.co/mozigizax/i1hg4GG/loner_lyrics_yungblud.pdf
    • https://cdn.sqhk.co/towevefizub/ifjhIqd/j_tube_rocket_stove_dimensions.pdf
    • http://boforotaje.mywebcommunity.org/70425253078.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_27cb12fec7474f149607ff9b62d87788.pdf?index=true
    • http://likewiwojuxus.atwebpages.com/ruvev.pdf
    • https://s3.amazonaws.com/wudibirewuduto/74104372095.pdf
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_722ced48e0394d1e9ce01dd573b9d72d.pdf?index=true
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_6b766334326d4e8aae4fe37b09dd754f.pdf?index=true
    • http://newepizudef.atwebpages.com/true_muscle_workout_plan.pdf
    • https://s3.amazonaws.com/besafefaf/business_information_systems_degree_jobs.pdf
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_3f6cc82a683c41b5b6c0a90a700e9762.pdf?index=true
    • https://s3.amazonaws.com/xuzed/airnow_android_app.pdf
    • https://s3.amazonaws.com/tufitijinexu/detox_diet_plan_weight_loss.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_off0000e5b0.bin
a62b76d0a790347abc7e19badebca8dff91e84e8d06d3838bbb55d6f528cdfe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 5568 bytes
font_01_sfnt_off0000f8b1.bin
25bf9d3df224e59a105c2eefc60a8e412a830ea48473547c096b743563e2a9c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 11216 bytes

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