Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f446355481a9ed0…

MALICIOUS

PDF

75.9 KB Created: 2021-06-06 15:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b6e4f5c86de7234a1caf3b2b1a125ba5 SHA-1: 2df262ec5d13335286e7fddb717aa853ba68dab3 SHA-256: 7f446355481a9ed05235aec9840687a84fc24f53a9d01677500993fb3bd7e1f7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains heuristics indicating it is a link farm designed to redirect users to potentially malicious sites, specifically identified as a phishing attempt. The embedded URL `https://coretry.ru/pbw?utm_term=how+to+pair+skullcandy+sesh+evo+wireless+earbuds` is the primary lure, disguised as a guide for pairing earbuds. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/pbw?utm_term=how+to+pair+skullcandy+sesh+evo+wireless+earbuds PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490735/normal_6004be4a45c92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_601ef0e6c6ba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_6023a72fb1947.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376357/normal_5fcefa42d4208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379959/normal_6051fb2c4fe7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_60526ccd5b521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443809/normal_603f7af3e77f1.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4476567/normal_60b7903e611b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489259/normal_60bba079c4a93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500189/normal_5ff20a2c7f8a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446638/normal_606c131082814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_5fd9ac1cbaea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_60544db9d2316.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lurilimid.pbworks.com/f/82962544963.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144422466/using_similar_triangles_to_find_slope.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/w/file/fetch/144505785/google_play_store_chromebook_compatibility.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/xigekogofokosawofibujil.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144607122/muxejazojoxisugopi.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/f/types_of_forces_physics_worksheet_answers.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/w/file/fetch/144446745/types_of_chemical_reaction_worksheet_answer_key.pdfIn PDF document text
    • http://dejimebez.pbworks.com/w/file/fetch/144620871/can_i_download_presets_to_lightroom_mobile.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/dipenaxapewepelatovowanef.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144411711/checkpoint_firewall_advanced_troubleshooting_guide.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_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 5580 bytes
SHA-256: bb392d01a382ae686294b9e1e02381edbecf7402dbdc3e25d3ccad30bef1ee7e
font_01_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 11580 bytes
SHA-256: b73d3e6aa07fa4a070ed19b6b6890cf2d213a7fe473980795ad6041c0322bfbc

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