Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca990ca7eea057b…

MALICIOUS

PDF

76.9 KB Created: 2021-05-28 01:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 40fe7e18b14528e594ad17e3d478a875 SHA-1: 7005794e8e15666e08b35371c9c70ff679cfbf00 SHA-256: 6ca990ca7eea057bb167eeb25170566245b47b2f61818b6a8f7c4bb19a74eb81
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 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=how+do+toddlers+develop+social+and+emotional+skills PDF link annotation
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/japumamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446921/normal_5fd9ba38d4d5f.pdfIn PDF document text
    • https://laximazerafa.weebly.com/uploads/1/3/4/2/134235816/2047645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393019/normal_6048655d3369e.pdfIn PDF document text
    • https://vanuvinuvur.weebly.com/uploads/1/3/0/9/130969573/8148671.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458837/normal_5ff940f583af5.pdfIn PDF document text
    • https://ladazogigewor.weebly.com/uploads/1/3/2/6/132681379/5622259.pdfIn PDF document text
    • https://xagufiwukana.weebly.com/uploads/1/3/4/6/134694649/4794789.pdfIn PDF document text
    • https://girosunemakafe.weebly.com/uploads/1/3/0/7/130739351/livijuvagujo_vokerigit_vateru.pdfIn PDF document text
    • https://mirigemiw.weebly.com/uploads/1/3/4/7/134753474/vivozabuzoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_5fd73e0f488e1.pdfIn PDF document text
    • https://zenibevakuziva.weebly.com/uploads/1/3/0/7/130739170/zejitemuwegolus.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/785d8685-16f6-4c83-8123-87cf64ed16b7/idylis_air_purifier_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/248a67d2-7069-4b63-a6ae-7cbce7657c14/cub_cadet_ltx1040_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b031d303-a41b-4ff2-a058-118264374cab/cashflow_quadrant_chapter_7_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f87bea5-e665-434d-94a7-0a7f2c7c005f/31865701160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d1b31c-1d2f-4941-91f7-146492333d2f/76932780066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ab24f8-b846-47df-9b4e-c6ead998eb91/fokuvaronizexugazusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f4e20f-3bfa-456e-bff1-a7bde19368b7/miwijisutukiripotasike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33a6a906-ce96-4196-9dc7-3f7577a1c81f/how_do_i_know_what_size_wiper_blades_to_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f805c84-377b-4906-ba27-98693542db18/pizobadalagilofivejuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0584ec-af17-418f-85e9-e8dd16066fdb/saginoruxife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91ae00e-f710-475a-affe-828620425a2d/2742855325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56073dce-5de7-4ecd-a6af-471d48bea28d/anne_rice_beautys_punishment_read_online.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_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 5396 bytes
SHA-256: 22296c7e6722bb4344216a4e6c07aacf0fde72d00fd61b4204f6900e57672cb4
font_01_sfnt_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 10484 bytes
SHA-256: 59d229b8274b951bf80a8aa564eaa315ba43fd2ba5f6acc89ae6317a50610b75