Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2115954cd5d59a…

MALICIOUS

PDF

72.7 KB Created: 2021-06-07 21:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6f1834ee5360b124908ad140d6f4c74d SHA-1: f9970a22f5834282eb67a11d9fce491d891fd75c SHA-256: 6a2115954cd5d59a1000602292ac62c2f13e8b7f8b722fd8d3b9e9517f8ff416
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the presence of numerous external URLs points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/123?utm_term=happy+new+year+tamil+song++masstamilan PDF link annotation
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/tusojuximomiga.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/juwog.pdfIn PDF document text
    • https://jowetetezuvam.weebly.com/uploads/1/3/4/7/134717416/rufabivan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144730458/how_to_level_up_feebas_with_max_beauty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6bced10-822f-4ef2-b0e2-3b069abf6ece/nugagojudesikefeloru.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144424455/github_bypass_paywall_android.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/f/dirowatizerowazijepi.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144439446/how_to_make_a_lego_republic_gunship.pdfIn PDF document text
    • http://molitutolu.pbworks.com/f/free_download_adobe_illustrator_cs5_full_version.pdfIn PDF document text
    • http://mizelabe.pbworks.com/w/file/fetch/144598464/what_recipe_can_i_make_with_egg_yolks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d129a75e-7996-4900-a51a-85ff38fa857c/how_to_dye_your_hair_with_splat_red.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/star_trek_spaceships_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c991f6d-19d7-4783-82fe-e8884a45fd03/letogujamekawixojaxotive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d150d30c-1032-428d-9ff0-a5510e92eae5/givebekadovegujiboder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95cb216a-5ec7-4654-8ee2-8cf0f2db0b61/bikebe.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144769101/what_is_business_administration_bba.pdfIn PDF document text
    • http://jobagej.pbworks.com/w/file/fetch/144610635/faxofokadorez.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/mad_battle_royale_mod_apk_download.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_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 5292 bytes
SHA-256: 6bcf9deac809e867cebc2256aab3d4893ab848bee31a19e95c11b8f8bad7114d
font_01_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 10484 bytes
SHA-256: 9fc8a90f6f18e9f7ef37c25e9342744391c7532d48459b644e35a4f3c6c75a42

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