Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb46a42092689331…

MALICIOUS

PDF

76.3 KB Created: 2021-03-01 10:30:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 08b7883ae944f06e8b8a30744f14d514 SHA-1: 981b89afc5cea3cc2b1a054d243749315819e94c SHA-256: cb46a42092689331e264be569527a62e37ac03408ac27854b79a7c010c5baae3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers strongly indicate malicious content, specifically a phishing trojan. The presence of embedded links suggests an attempt to redirect the user to malicious websites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://midufefew.ru/strik?utm_term=hp+officejet+pro+6835+not+printing+black PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374978/normal_5fecb7c3391a8.pdfIn PDF document text
    • https://gidorimafemona.weebly.com/uploads/1/3/4/8/134867851/9fc91b0d5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412774/normal_6039187c6406b.pdfIn PDF document text
    • https://ximepovefuvaxoj.weebly.com/uploads/1/3/1/8/131856443/xenebijip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497358/normal_5fd04e917435c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371509/normal_5ffbb0eff0515.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401994/normal_600577f7e8a5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411683/normal_5ffe97dfaad95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457590/normal_601386a6e6dc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486061/normal_602083ce386c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425256/normal_5fd047559b4ac.pdfIn PDF document text
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/ninifezun.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/what_to_bring_to_a_valentines_day_party.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390681/normal_5ff38862658f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372702/normal_5ffd1df8ddbb7.pdfIn PDF document text
    • https://kelodopaseku.weebly.com/uploads/1/3/1/4/131406239/vopig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481156/normal_5fdb2b5361718.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486981/normal_5ffaaa3e8c50c.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/why_is_my_dishwasher_not_fully_draining.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zejibanunepi.myartsonline.com/zuzekavosutamibax.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/how_to_rebuild_small_engine_carburetor.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_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 5884 bytes
SHA-256: 98a04e88245015d4dd96c67abda661016487e9fb994c6ebc9a74108d4c1d498d
font_01_sfnt_off0001014c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014C 9972 bytes
SHA-256: 26419558ed8ff8f63f41db2a7f5dc62702ed34d9505999408dd9928cbf83c741

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