Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4cf19d59d88f6a…

MALICIOUS

PDF

78.4 KB Created: 2021-05-12 02:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 40f9a18538159370e37ce9b8278dbbac SHA-1: 5cd64068e977292b0fc474dddad8ecd1316e528c SHA-256: 4a4cf19d59d88f6a8c173aa16544aefdc23bf4b357394f109c1061fac79b1e60
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a primary suspicious URL being https://bologen.ru/strik?utm_term=does+hiit+make+you+faster. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the overall structure and URL analysis point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/strik?utm_term=does+hiit+make+you+faster PDF link annotation
    • https://subozabi.weebly.com/uploads/1/3/2/7/132710736/favasitebo-pevunevefeza-dozaligokixe.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/iioRcgh/gawanopogidod.pdfIn PDF document text
    • http://tuwafanumi.iblogger.org/ejemplos_del_genero_lirico.pdfIn PDF document text
    • http://sigixez.22web.org/python_exploratory_data_analysis_tutorial.pdfIn PDF document text
    • http://lofomerevudawem.iblogger.org/fuvegigawi.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/Hgeihjc/gowavajot.pdfIn PDF document text
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/4096071.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/ibgfgd9/12729300998.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzodidudi/igZiizo/91116106631.pdfIn PDF document text
    • https://fusavufotopos.weebly.com/uploads/1/3/4/6/134634064/2123819.pdfIn PDF document text
    • http://kizidotiz.iblogger.org/common_core_4th_grade_math_book.pdfIn PDF document text
    • https://biparobotimipus.weebly.com/uploads/1/3/4/4/134498468/xuduguragibovagu.pdfIn PDF document text
    • https://berafakeje.weebly.com/uploads/1/3/4/0/134000448/908919.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a00bdce-cc0a-4dee-b3d6-6abd52c23db5/commodore_64_keyboard_buy.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/airport_vocabulary_english_exercises.pdfIn PDF document text
    • http://sekijipaladi.epizy.com/86701351423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78aa15c3-e355-422b-b97b-24a9a3342d83/zejejikareliwedaxuvam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2aa3f5a-9d8c-4ac6-ae4d-733e4d2762f0/24831859570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bab0391-1a66-45c2-bcae-db3da841d3e5/personajes_principales_y_secundarios_del_libro_rebelion_en_la_granja.pdfIn PDF document text
    • http://pawolukexuw.epizy.com/apartment_letter_format.pdfIn PDF document text
    • http://pemojam.rf.gd/beverage_menu_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1db27a1-6dc4-4fa0-9d50-175d2faaa031/beats_solo_2_wireless_used_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779403e6-ec7d-4a74-96a0-a011a84309d4/kebomojexodikozinukewisir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d826841-dc5e-464f-ad74-007f42573d03/9548980131.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_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 5140 bytes
SHA-256: 1ffd022ac2fec0eeb938dcd4a8a2279d0b40a776445d1be612b095088a4e6e3d
font_01_sfnt_off0001086d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 10696 bytes
SHA-256: 2086b761ce7cc2407c815cd5e74949178f46b55b03b75a5cf3d327403e86ebec