Malicious PDF — malware analysis report

Static analysis result for SHA-256 4718b723e2a4990d…

MALICIOUS

PDF

80.8 KB Created: 2021-03-10 17:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7296aaac25c9178b0ed7cb3a6ba78961 SHA-1: 29aba5a10052f403e1abae6de2129dbf0ff8eed5 SHA-256: 4718b723e2a4990dbae32089dff10a5f489c23a113a20d912b640f5861617ce8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, one of which is `https://resalured.ru/strik?utm_term=dewalt+pressure+washer+3600+psi+no+pressure`. The presence of a link farm suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=dewalt+pressure+washer+3600+psi+no+pressure PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417824/normal_5fdcef429866d.pdfIn PDF document text
    • https://cdn.sqhk.co/livaxipovage/hihiiTx/73258766385.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/Lghjj4Z/59705191115.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/egfPicB/ib_road_trips.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_604502bb1c845.pdfIn PDF document text
    • https://cdn.sqhk.co/modesinilofe/dDnW1mu/69534099008.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/hfjaMjd/costumes_for_couples_halloween.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_6022e021f3d10.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/BfvzWhf/the_impossible_game_24.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/elhajd1/bad_banks_staffel_2_stream_netflix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_895552dc0541463285ea1cfbdcecd9f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kewakuko/42183206517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42830f36-064f-49c4-910e-3755be9cd86c/buguzexosuzesesinera.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_7f41c6d849df43519fa231fb20520e45.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_379eed0245164a1799075684468ac41b.pdf?index=trueIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_7fda850a678f4ca4abe23e11c4d30dd6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/803934e6-bd24-441c-8a66-b9248f8d0f91/the_science_of_mind_management_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d34a8a-de83-41f1-b099-984f44b55738/attack_on_titan_season_3_part_2_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/ranabiliwezebebal.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_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 5460 bytes
SHA-256: 78c85a45b063650de7567cf4cb546a4563b657a48ccd3ff1117c96109528c097
font_01_sfnt_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 10852 bytes
SHA-256: e4cb3201b6c519f75fe0a5e8c71e7cbd6dda51773a6a93143cb445ce78d58832