Malicious PDF — malware analysis report

Static analysis result for SHA-256 667dc1d361ff5623…

MALICIOUS

PDF

79.7 KB Created: 2021-04-16 20:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 29e2b48073f5032d77486313546e21df SHA-1: 963d1db56b5da8d4a6aa2dd279f735367e69de80 SHA-256: 667dc1d361ff56235a0dfb98c70d0aae4c8e64047e35dc264404c5012f1fb222
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/strik?utm_term=how+to+tell+how+old+ao+smith+water+heater PDF link annotation
    • http://gizaripe.iblogger.org/add_png_to_jspdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367643/normal_5ff5b3354db91.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/d0ghZji/nba_live_mobile_basketball_mod_apk_latest_version.pdfIn PDF document text
    • http://pajalegi.iblogger.org/how_to_record_accrued_expenses_in_balance_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/dojoxuwote/ibkIgdS/kml_kmz_waypoint_reader_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/GjihI85/marooned_with_ed_stafford_season_2_episode_6.pdfIn PDF document text
    • http://linikewi.iblogger.org/anestesia_geral_balanceada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466391/normal_5ffbdeae188fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_5fdbfef82fc9d.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/f8Uhhgh/27863090280.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/dxpOkhe/9966537458.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/jfjhjjg/36309883454.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/Vif2igo/pocket_door_kit_soft_close.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/600fca22-c49c-4c8e-ac94-a850b458b947/metal_gear_solid_v_the_phantom_pain_quiet_location.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_4dd82705e54d4992ab53db7380863d51.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_3d05db11e1674e0a902e2b9c7df13923.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fe1ffe-68da-46e8-9572-f037e6a3dcbc/neranerulazisegazisik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f99f2c-1969-409f-958b-f07d6c5ef9c8/voxerapatesagaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bcf38a5-b895-418d-a309-dfd5bd2c7621/pejinujurarositodibav.pdfIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_4d8c3fe558e647329961ab284fc78a16.pdf?index=trueIn PDF document text
    • http://gimobomir.epizy.com/jam_transit_mini_buds_not_connecting.pdfIn PDF document text
    • http://batezitiguduf.rf.gd/zoramul.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_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 5120 bytes
SHA-256: 5c6e0263cc75d712e0d899c1797ef0241b6483aaf84edb136981315c67551eee
font_01_sfnt_off00010ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 11212 bytes
SHA-256: 249955e3131f6b7c84e58a26a6fa61d381954347592312fd46c231d9592e3488