Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae7c45a223edf47…

MALICIOUS

PDF

79.9 KB Created: 2021-04-18 10:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 23a7b385a447b12bec26ab15d93618e8 SHA-1: d847ed3ba57c86802303bf94a7e317accec66785 SHA-256: 3ae7c45a223edf47f4cdcaff31b4f019072b3c37fbad373ea67175eca12f098c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('gimoguvi.ru') that appears to be part of a link farm designed to redirect users. The presence of these links suggests an attempt to drive traffic to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=mini+dvi+to+hdmi+adapter+for+macbook PDF link annotation
    • http://berkeciftci.net/kafuzasojesomaw82b55.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/bwLPGHE/heli_100_apk.pdfIn PDF document text
    • http://alfa-quest.ru/beauty_cosmetics_website_templatesfn4t6.pdfIn PDF document text
    • http://kujinatazema.sportsontheweb.net/nozukagusisaz.pdfIn PDF document text
    • http://kawafopi.mygamesonline.org/zewiwulejolaniba.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • http://setafugeridol.scienceontheweb.net/majigenim.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/N1Xiihg/wukanurapijebi.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/q2Mjegi/xobipilumerutanimofekova.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/5nfhcM2/31891475259.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/dulatafopufefivosawedunu.pdfIn PDF document text
    • https://cdn.sqhk.co/petebodok/xMxgibr/centrelink_healthcare_card_phone_number.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/20518585349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e28d129-499e-466e-b2d6-16605c6480ec/how_do_you_reset_an_ao_smith_water_heater.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/zuganasufuta.pdfIn PDF document text
    • http://nifusotajezunur.atwebpages.com/map_metro_madrid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8d84ba6-9d73-45b7-9d80-bf6bcdcecdad/6314942782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a9d41d7-4d8c-484d-bdcb-2582ee05909e/honda_2000i_generator_fuel_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45dc4e0c-fd34-493d-b741-74997f3bf8d4/lumuxifalekorogagadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b7f70a0-65c0-447c-bbee-609cd011b44e/xukupafagaxalerat.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 5452 bytes
SHA-256: 3753608ac8f6fccaa1637b365691ee25c3ffc8c53f8138f285c251130bf6c8e1
font_01_sfnt_off00010de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 10816 bytes
SHA-256: b9dd41caac004be5f9fdec52a41de703e013a00ee9f39edaae5d0ff9838b1dca

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