Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e3f65f0b87c115…

MALICIOUS

PDF

70.5 KB Created: 2021-06-01 07:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d6e62ca67cbd6f30af77ca888ddad1f4 SHA-1: 15f2fe5fb02ac836e898adb18b8158be54bac7d2 SHA-256: b3e3f65f0b87c11545bd5d536a74a146ab2bf7da5de03ad02afb64c5918ad2d6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://cructi.ru/pbw?utm_term=full+focus+planner+getting+started PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375504/normal_603be111b6130.pdfIn PDF document text
    • https://zaluvofajiziso.weebly.com/uploads/1/3/4/8/134894723/2156173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453142/normal_5ffb76c5c7a89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481061/normal_5fe6af5198d87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417226/normal_5fe590f8e7c8f.pdfIn PDF document text
    • https://feditesar.weebly.com/uploads/1/3/1/4/131483001/4406222.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozixokumo.pbworks.com/f/aaa_battery_dimensions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8486f9ec-812b-489e-b459-1e4b907ec268/1994_craftsman_gt6000_specs.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/96281506542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27febfd5-d77a-4f4a-b721-ce932e2a0955/gavokarupizetirobaxob.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/why_the_hell_are_you_here_teacher_unblocked_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e561766b-f5ff-4c0a-ac3a-53de88ee96b7/mudisolisilavetukuluvolen.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/64012101353.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144428658/libro_de_matematicas_3_grado_contestado_paco_el_chato.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/football_quiz_questions_and_answers_with_options.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f72b4d8a-0f13-400b-a643-a78efc974d66/21999388523.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/xemosete.pdfIn PDF document text
    • http://banusiv.pbworks.com/w/file/fetch/144442776/56472508303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/625949f2-a67a-437b-b088-0b10b173ef93/83065198227.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_off0000d51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51C 5276 bytes
SHA-256: 6c28a4cd55c66872c876d7977052a722cfc033675b3740db9c6b6f438d43add7
font_01_sfnt_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 10980 bytes
SHA-256: afbcbb1f3623b779ce3d7a1e5d91fd14f0f3ddcc109772096e9bf79cf6366f13

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