Malicious PDF — malware analysis report

Static analysis result for SHA-256 261b9673a63a116c…

MALICIOUS

PDF

79.6 KB Created: 2021-03-19 07:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 74d5e85811bdb7388f246330387ead95 SHA-1: e5bbd7020f2f0f94039f6791f17919c836205d17 SHA-256: 261b9673a63a116c636f6364b80259abb440d376933fc0694f1e206e8b0fd092
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'midufefew.ru', suggesting it functions as a phishing lure or a gateway to further malicious content. The document's structure and embedded links are indicative of a link farm used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=177+mental+toughness+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477163/normal_5fdd710377601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_6022d3e9db6a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408713/normal_5fcbc9829c7a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476011/normal_6004cb7b87500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476302/normal_60402e508f174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_60138e9747e91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409623/normal_603b9d3482ebc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417423/normal_5ff3d6eb727a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_5fd672676a070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_604e194b1ff0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wulesubutufazaw.epizy.com/fodebikuwisosiziwuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6072202d-6a2a-404e-b1ac-712e4c252801/16944350724.pdfIn PDF document text
    • http://dolifusekaxug.epizy.com/inspirational_songs_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ea086d-6246-498d-8a81-3213c34c67b0/paxotumorinokurusejatot.pdfIn PDF document text
    • http://kuporalegumema.epizy.com/contagion_movie_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6465d35-8fe1-4ee4-a190-999d3f278d5a/fijajekoxaxezomi.pdfIn PDF document text
    • http://tobobuximalusu.epizy.com/tom_and_jerry_cartoon_tamil.pdfIn PDF document text
    • http://ratazudawi.epizy.com/hal_leonard_sheet_music_online.pdfIn PDF document text
    • http://vekifaxofezawe.epizy.com/kit_brush_photoshop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da9605a0-11bc-41f1-b9ab-fdcb363b9ce1/xemuloxinewilasesezuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0140bf54-3e09-44dc-bf56-09da7d8d5efb/asus_xonar_d2x_xdt_a.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_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 5396 bytes
SHA-256: dc530c3868c51141a684548faae6058bff8471cb017b750ffe6a154d103d2d51
font_01_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 10996 bytes
SHA-256: 9fabd95c2272316dddbba1de4fc6037457bc3c8cab26d5936e89256253d8a901

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