Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49d9f0e4f0f5365…

MALICIOUS

PDF

78.7 KB Created: 2021-06-03 21:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4ee0024de4eee4381d1d29ccfc2b5355 SHA-1: b42cb46c119166066e471befabe0fb7a6f53d513 SHA-256: e49d9f0e4f0f5365f7a98dc9664fbf92c0d16f6db1746ab3ebefa6990545a512
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The primary malicious URL, https://midufefew.ru/123?utm_term=chromaticity+diagram+template+origin, is likely used to redirect the user to a phishing or malware site. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a phishing or malware delivery attempt.

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://midufefew.ru/123?utm_term=chromaticity+diagram+template+origin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461207/normal_601a86133fd82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377931/normal_5ffd3f461d196.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377128/normal_5ff87d7d7f16f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_60111ed69bd64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489032/normal_603d204f5524b.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/46f203fe-c392-4b00-9c1b-a6b6f668149d/wuxuxajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89ba4e1a-856c-46fb-87e5-9626c816c6ea/34959432002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb0e6fdd-0f91-4d83-8a45-89ceb40fea56/93770725797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2add7989-73a9-4fd0-b2d8-8a6c8224a916/how_to_turn_down_volume_on_vizio_without_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc11642-1396-4aea-a149-f3bf10e3e122/ho_scale_new_york_central_niagara.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144425265/dd_ship_map_maker.pdfIn PDF document text
    • http://fokojifidesi.pbworks.com/w/file/fetch/144515256/lubemafojaralemi.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144534966/funisimik.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144415869/reading_the_middle_ages_rosenwein.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144570816/how_many_types_of_bolts_and_nuts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec58860-8a13-4a78-b396-044354a7e740/sharp_el-1197p_calculator_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d15ea95-e6f7-419c-a06c-d5759686c68c/79164479026.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144413373/63455188248.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/vajaminegadamanajat.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411483/76558110092.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_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 5316 bytes
SHA-256: eb2b87ed62cceb9d61e210fb8dc202c8ea33f8b30f04d4f99a2b0cf03e7f5d9c
font_01_sfnt_off0001072b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 11116 bytes
SHA-256: 74354e84ab57d626a7eec0e28f711cc963938b7c52cf3092fe424c4e427cc19d

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