Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fefa03af86a6cb1…

MALICIOUS

PDF

82.9 KB Created: 2021-03-22 17:10:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dc288440b31ef9e7198f08f282f46669 SHA-1: c0d1d3f9091c6d31edc46a658163a86211ceeea8 SHA-256: 7fefa03af86a6cb12232722efca7a09a4922b292169ef96917475044b6dcf182
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though truncated and obfuscated, contains keywords related to an "army acceptance letter" and references wkhtmltopdf, suggesting a lure. The presence of external URIs, particularly the one hosted on jumiwimov.ru, points towards a phishing or credential harvesting attempt, likely involving the download of a secondary payload.

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://jumiwimov.ru/award?keyword=army+acceptance+letter+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5fcd81309eead.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401971/normal_5fcdea0fba089.pdfIn PDF document text
    • https://cdn.sqhk.co/pavuraxutem/pihOuKQ/sinadodawuliranoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_604691356cc09.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/jahfrl5/lakepig.pdfIn PDF document text
    • https://cdn.sqhk.co/nijegonusas/gg1djgg/fovifumilegudizezibopalox.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/pesquisa_quantitativa_e_qualitativa_conceito.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/acca_f8_study_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/ijUhbia/midigabojineruzovites.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://balanuvanatitan.epizy.com/9430002865.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_bba00a4a141a4859960d8248773674be.pdf?index=trueIn PDF document text
    • http://rosuronuvure.epizy.com/bse_odisha_9th_class_english_book.pdfIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_ae453e72c77249f08824cc93efe26607.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libeganot/chest_guidelines_pe_anticoagulation.pdfIn PDF document text
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_effeb063af9a4ecba774b3a917f34e83.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_91a60e3437124b42820665e0fae1ced0.pdf?index=trueIn PDF document text
    • http://tuxefunuzire.atwebpages.com/bivuf.pdfIn PDF document text
    • http://xewegifugeralot.rf.gd/chhukar_mere_man_ko_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/digotudofivepelesivoki.pdfIn PDF document text
    • http://lulevewutowa.epizy.com/80510619095.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/bhagavad_gita_15th_chapter_in_english.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_34ce94099b6c42ff902f1d30e296e7ac.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_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 5212 bytes
SHA-256: c9100aec2189b9aa204a96c7e0cc129642ee6cebffadbfefad1bff21a259d3fc
font_01_sfnt_off000117d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D8 11244 bytes
SHA-256: f85165a90f1afc2179a252ca0d8d0b17692971369d702b6a3dd3e1c367982fc0

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