Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b8fa584e8e4b0b…

MALICIOUS

PDF

72.7 KB Created: 2021-04-11 14:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c3d9aa685e29df27f4e8dad3d00a3e1c SHA-1: 1762c5d7cf21c241587e3311c325139e9c1a1a64 SHA-256: 10b8fa584e8e4b0b01f6d69ca12fa95c7536014c2c1a01d03c1bcaf4a63dee30
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 0.9991

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://kuzutuzo.ru/strik?utm_term=fourier+sine+transform+of+e%255E-2x+mcq PDF link annotation
    • http://braco.ru/castaway_cove_waterpark_wichita_falls_txwjtmm.pdfIn PDF document text
    • https://jajesawi.weebly.com/uploads/1/3/0/8/130813829/vagigibo.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/eb8be641.pdfIn PDF document text
    • http://tevfikyuce.xyz/zogilutibawixunudiperrzf6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464851/normal_5ff991810f0f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449172/normal_6028085845a08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_5fe8dccb28454.pdfIn PDF document text
    • http://mosdendy.store/zurivizupusogepilapid9sq9m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_601f9ac7b5c62.pdfIn PDF document text
    • http://drnextact.xyz/20810645100td9d4.pdfIn PDF document text
    • https://gimipozadifan.weebly.com/uploads/1/3/1/3/131380487/dofenobip.pdfIn PDF document text
    • https://xukonupuzifig.weebly.com/uploads/1/3/4/6/134621954/lesesobuputipeje.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/7235bb6f-11cc-48c0-8520-b5a303fa27c2/lotijapasem.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/wemivanaxotunodukot.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/kuvajoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9343630-5597-4af9-b242-5d0aa9f9a36a/roxodagivusuzasud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69072156-7a5c-4b8e-b14a-5bfd98ac470b/powers_and_functions_of_state_information_commission_under_rti_act_2005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c0d99b-6606-48cf-9cfd-61e5c4298ed1/riwedifumizereg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b48bc508-aa9a-4a37-ab16-4facce200744/zekusikafedunifagolire.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/pitiwotomiforazegeloke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6289ae-bc5d-4c61-9a6b-e63f04a3e41e/yesterday_tractor_hauling.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/ensign_peak_advisors_inc_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8c8c3c-93bd-4897-9323-8b617ea1282c/what_are_the_best_books_for_5_year_olds.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/fisoverelatasolakakaguj.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_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 5356 bytes
SHA-256: d04a9e47b31b1d943c944428a34357a9ef342203cec057657b28c1bd40d1ba7d
font_01_sfnt_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 12408 bytes
SHA-256: 33bf0b49a13f053c3aa4aca537cc602a8bf085224c99e37b1c9d3fd00b8a59cb