Malicious PDF — malware analysis report

Static analysis result for SHA-256 904587e0a104c127…

MALICIOUS

PDF

82.8 KB Created: 2021-03-11 21:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 318154133d6650d36a10750094786edc SHA-1: 396a0dd7648a5cd2363368973302cee42122a874 SHA-256: 904587e0a104c1276ac19a17af9f0daf2eda8af2e5c07db4c353aa4eb7845a7d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, suggesting it was generated programmatically to appear as a search result for sheet music, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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/award?keyword=canon+in+d+violin+and+piano+sheet+music+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478131/normal_5fdc6cd6d5f8e.pdfIn PDF document text
    • https://cdn.sqhk.co/vilosezuj/iejbbij/6306241701.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/OjbKJlo/easy_flower_pot_painting_designs.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/kowadetamatiridejelefo.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/best_curriculum_vitae_samples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408704/normal_60434ee6a6525.pdfIn PDF document text
    • http://rabusasomel.22web.org/avenza_maps_android.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/autocad_student_account_sign_up.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/59693365898.pdfIn PDF document text
    • https://cdn.sqhk.co/novupezezis/jjJjbT6/duwozeletedujukaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478422/normal_5febf01067208.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/top_10_photography_tips_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/koxixoneto/gghjf6Y/pixel_worlds_admin_tools_hack.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/47597417834.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/paragraph_structure_worksheets.pdfIn PDF document text
    • https:///www.youtube.com/watch?vIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dapizodipe.myartsonline.com/used_mercury_150_efi_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d07526c5-d6a2-4aa0-830d-dd21fbc21f08/grid_dnd_5e_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b071c0b6-26b3-49ec-8645-ea1541bb0910/shark_rotator_professional_lift_away_nv501_reviews.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/96115089877.pdfIn PDF document text
    • http://jizofaludem.epizy.com/kuzex.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/compulsory_heterosexuality_and_lesbian_existence_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83ace9d-92f8-42f0-946d-3dbf5318e8fb/68982600689.pdfIn PDF document text
    • http://dovagoxaluzof.rf.gd/soccer_ball_cake_template_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef90280-5a7a-4f5d-801d-c6be0e436527/bepuzijafeketakawavaz.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 5264 bytes
SHA-256: fc39eee03290a15c4ff9188c20ed1667c1a3338d2a2ceebd3673d8ff1a60507c
font_01_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 15292 bytes
SHA-256: 78e2f4238c5e45b6a1c8320d67bec594db94d9d590af031ba20d9948432d2637
font_02_sfnt_off000127c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C0 16184 bytes
SHA-256: 4360e29b7d2504916afe74d557016965ce00ddb6e9b1d1498b998f2d7a1046f9