Malicious PDF — malware analysis report

Static analysis result for SHA-256 983adeeb1b105fd1…

MALICIOUS

PDF

77.4 KB Created: 2021-04-15 21:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6796eec6ffa7931e60b44e3e40373a95 SHA-1: b1f93d4870bc2289d2ecadb9956246687940bf72 SHA-256: 983adeeb1b105fd18e72b193e27e4edfefd49ca893e10b855cb382f40f91fb18
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 0.9997

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 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=fender+super+twin+reverb+mods PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470228/normal_5fdc703e15e29.pdfIn PDF document text
    • http://nopadejitakuf.22web.org/kikironaferes.pdfIn PDF document text
    • http://lusivemewuza.22web.org/62761309850.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406482/normal_5fdfb528010f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426558/normal_606080adcfc90.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/35e243bc-16a2-4398-8f0b-a770e7294e4f/hp_7520_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/cracking_new_sat_2016_part_5_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee469a26-c617-4a67-aa51-bc6065e913ef/nibimukeweripozuxugarit.pdfIn PDF document text
    • https://ff102949-4c65-4b7b-925c-ea9a98d885fa.filesusr.com/ugd/7a16bb_08ebcf0e71ad4b11b44229c5cf55a231.pdf?index=trueIn PDF document text
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_1e7f52274b2240bbaa33bd2e45274923.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_54fdbcd7d725460da0c233825a843a2b.pdf?index=trueIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_d9bf36e1925b42089b3b2237835a44e1.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_a390156f21b54b5da4bb48c1cbe47dde.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/35183290584.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/73474295215.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_21f0791b6a864242a508141f9a3a0b48.pdf?index=trueIn PDF document text
    • https://3f7ff619-1e23-491c-a925-ddda4d79b49c.filesusr.com/ugd/79c22a_0101cd5f32cb41b0a7e3ef87992d02fa.pdf?index=trueIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_cd398b38c9574407a6442c7de02bfb65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/android_choreographer_skipped_frames.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/meteor_60_seconds_guide.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_9f3456879ee240cf86d9137cf8edc9f8.pdf?index=trueIn 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_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 5112 bytes
SHA-256: f6e7ca8d36d59dbfa36ef2f35d22d0eb45c205f6ea2302c62a3350e42c992fcc
font_01_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 11116 bytes
SHA-256: c285b7cc4c2e8a11ce007158988a7f53cb5549b818e9ae7354570c6e2f8a3245

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