Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea73cf368ca095f…

MALICIOUS

PDF

76.9 KB Created: 2021-03-05 04:31:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c30340ff316acb92e49923ef6a81109c SHA-1: 431564c474708001812f8c084a9514cad65f6028 SHA-256: 3ea73cf368ca095f25511c17c4f2330aee80f70a4ee38f3556a5fd9a336cfd45
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. One of the embedded URLs, https://golowaki.ru/award?keyword=oster+pro+1200+blender+food+processor+attachment, is likely part of this malicious infrastructure. No scripts were extracted, but the PDF structure and numerous external links indicate a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://golowaki.ru/award?keyword=oster+pro+1200+blender+food+processor+attachment PDF link annotation
    • https://cdn.sqhk.co/jiluputumusi/iiCSxid/60311064717.pdfIn PDF document text
    • https://cdn.sqhk.co/satofurijob/cAfUFia/19368863180.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/jfQwiia/the_burger_shop_hernando_ms_menu.pdfIn PDF document text
    • https://tamexixufose.weebly.com/uploads/1/3/0/7/130739892/setifasekeg.pdfIn PDF document text
    • https://cdn.sqhk.co/sawowudin/ikicN54/62785542921.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/64d12788.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/ig00yJf/choppa_fortnite_season_4.pdfIn PDF document text
    • https://penuwepilaxol.weebly.com/uploads/1/3/4/7/134756509/nujulir-monopiwipamudew-nolenupujulene-rulagozediw.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/fcNARKa/webakugosek.pdfIn PDF document text
    • https://jedebesoza.weebly.com/uploads/1/3/4/7/134739829/2955692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_601ae0ba12ad0.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/QVPhfhh/french_aircraft_carrier_world_war_2.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/lozur.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/gjigfyN/munumowezeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5fea35085121b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b903dd-1f19-4325-9e4c-e3233f541d66/hbs_760_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b050cf9f-cd73-46a4-a7e2-46a4c723df43/dbx_driverack_360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a20276-3390-41d5-bb40-515aacc453ef/how_to_repair_kitchenaid_ice_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/vovixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efdbaf78-86a9-4c31-ac78-350498631106/30232264997.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/bubble_sheet_college_board_sat.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/34300989835.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/giwalafemufiv.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_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 5888 bytes
SHA-256: ac6d3a15c22be96148bb7f07da334685bd31ad5f2de56a19817f66cb73cb84c5
font_01_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 10376 bytes
SHA-256: 38f67313b1ae5d1a8a003833539fdeb9fcc797b3c1fb6f801a6187e8bbccd704