Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d2d0c2cae13f21…

MALICIOUS

PDF

76.2 KB Created: 2021-05-22 07:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f9099b2eb2f54443b86632f7b880db72 SHA-1: ea109d8e320ef70b15edaaa1c49e550e60ca6785 SHA-256: 54d2d0c2cae13f217189028da1c37a1c2a17fd8f943a470bd163247ae3811121
134 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm designed to redirect users to external sites, with one specific URL identified as a lure for downloading software. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and embedded URI point towards a social engineering attack to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/strik?utm_term=photoshop+cs5+software+free+download+for+windows+10+64+bit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5fca49356a1cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_5fd72f0d75a12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_6025db14ca142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5fd9b1e0ca0f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490266/normal_5fd1b7fdb2697.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_6003a153d7f6f.pdfIn PDF document text
    • https://televonifu.weebly.com/uploads/1/3/0/9/130969274/7044804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_5fd92d0e34de0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448740/normal_5ffc7124c2a6f.pdfIn PDF document text
    • https://xizidalubatud.weebly.com/uploads/1/3/4/5/134583516/zodupufano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417656/normal_6054f6f1b8c4b.pdfIn PDF document text
    • https://zasetumodoroba.weebly.com/uploads/1/3/4/6/134692621/8862501.pdfIn PDF document text
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/kerirajelaka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gujutavevive/performance_bond_l_g.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/62237944315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ee1ef6-7373-43a8-b563-f13f3c86301a/mutants_and_masterminds_third_edition_character_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a276900b-1490-40b8-9d27-4edab8a732be/is_mass_culture_the_same_as_popular_culture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05325cfc-8aa8-469f-b5f2-e350c713c5d0/xusidodagapasixoxutit.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/wii_u_console_new_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f242bb83-df5d-4b81-93fe-e673df602a6f/76336893060.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/17980397108.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 5824 bytes
SHA-256: fe54afc6c0a8671769ece0ff1ef590f4aab94931025287b204030372cc42f0a8
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 10524 bytes
SHA-256: bd14691d27a108192dbe3b4e7d4303ddcde035dd71c2c7bfc268a47004541593
font_02_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3