Malicious PDF — malware analysis report

Static analysis result for SHA-256 440f8a285025ee9e…

MALICIOUS

PDF

76.7 KB Created: 2021-04-11 15:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4ce02fc104c9bba9fff9dfd1c4b9bd3f SHA-1: d8be810bbf480962c9a7b5e5f31924dabe377a13 SHA-256: 440f8a285025ee9e71d7cf2dd6bba257d76e9bb494e392452254baccbec0a453
186 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 ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/strik?utm_term=print+head+alignment+canon+mg2522 PDF link annotation
    • https://cdn.sqhk.co/fosuzonarefi/ig3jhjf/xolefefabesutamadodoziju.pdfIn PDF document text
    • https://japujavawewiri.weebly.com/uploads/1/3/2/6/132696154/430050.pdfIn PDF document text
    • https://cdn.sqhk.co/jetuzama/iaShdq1/wedododesezejobar.pdfIn PDF document text
    • https://kijapipova.weebly.com/uploads/1/3/1/4/131407887/jeroxos_lamazibe_tokavopi.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/bIjdhih/ww2_battlefront_simulator_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/Yhbhbjg/assimilation_and_elision.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404502/normal_5fe30e524b8d1.pdfIn PDF document text
    • https://cdn.sqhk.co/tatomaxeriri/gjxigjg/77557588654.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/jBijjfd/troll_face_quest_video_games_level_32.pdfIn PDF document text
    • https://firiwipavixura.weebly.com/uploads/1/3/1/4/131407767/3003b.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/gheithd/ubisoft_prince_of_persia_escape_room.pdfIn PDF document text
    • https://cdn.sqhk.co/dutigimomana/djcjaFv/lisote.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479707/normal_5ffcc756d3378.pdfIn PDF document text
    • https://wuripofowiwafu.weebly.com/uploads/1/3/4/3/134332549/8ef7ff2d781.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489255/normal_6003e07dc718d.pdfIn PDF document text
    • https://tipureroxagojox.weebly.com/uploads/1/3/6/0/136096040/6455822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_605ad25390402.pdfIn PDF document text
    • https://nekurunezofadi.weebly.com/uploads/1/3/4/8/134892804/6820861.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_69cd20a8397a4544a2755714d9601ec1.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_1a087f60749444b78b0acdddc718a5b3.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_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 5432 bytes
SHA-256: 9eebe1430f39f180afd51cfdc8570225b288ee98697c5b926181974a793cf15b
font_01_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 10756 bytes
SHA-256: 6131ba764914149cb037629ef5ccfa38c38260533f0622ba726daad2c8201d88

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