Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fa54962e3de2cf…

MALICIOUS

PDF

76.6 KB Created: 2021-03-23 16:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83c622fdb337ba1386d44247e8e9653c SHA-1: db12e5d2f28caa285810dce09aac34f4ed4e6664 SHA-256: 57fa54962e3de2cf081fe9e0bdf33c57df83cb76eeccf8474a226d3daece1464
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely serve to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=how+to+fit+renault+megane+wiper+blades
    • http://tumerasiwabuzip.22web.org/47143802215.pdf
    • http://wijebibot.iblogger.org/80843710168.pdf
    • https://xijogokamu.weebly.com/uploads/1/3/4/7/134721509/futumu-dujeded-sivovig.pdf
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/garovivelefi.pdf
    • https://xomarexisu.weebly.com/uploads/1/3/4/7/134701616/7351555.pdf
    • https://roserilufelojow.weebly.com/uploads/1/3/1/8/131856860/xavewunirinudufi.pdf
    • https://mubonunegaj.weebly.com/uploads/1/3/0/8/130874179/voful.pdf
    • https://surewiseg.weebly.com/uploads/1/3/4/4/134465661/9980363.pdf
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/8133449e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gixawetopoli/wukibapelonawasoxopazij.pdf
    • http://lutusodil.epizy.com/ziruda.pdf
    • https://uploads.strikinglycdn.com/files/eacfe679-28ec-4c2f-87e9-fe52c1ee8308/fasijenibuvaninokilowoz.pdf
    • https://uploads.strikinglycdn.com/files/4f0a32b4-8f8c-472b-aed7-80fed63ae37e/como_forrar_cuadernos_para_nios.pdf
    • https://uploads.strikinglycdn.com/files/21ac0206-fa23-44f2-96ef-79695bb5bb38/29323820245.pdf
    • https://uploads.strikinglycdn.com/files/3507c573-dd93-41a7-a742-6ff171ed0a13/21461724299.pdf
    • https://uploads.strikinglycdn.com/files/4dd963c5-de2c-48d6-8506-253a7dacb195/72154058126.pdf
    • https://s3.amazonaws.com/zuniverijesud/obod_course_cost.pdf
    • https://uploads.strikinglycdn.com/files/32d76e01-24c9-40a4-be7e-09bcc012feba/night_owl_hd_4_camera_review.pdf
    • https://s3.amazonaws.com/gulapore/grange_hill_theme_sheet_music.pdf
    • https://s3.amazonaws.com/lejivugeleguwod/kijamediweko.pdf
    • https://s3.amazonaws.com/wanasuvedigo/autocad_2011_crack.pdf
    • https://uploads.strikinglycdn.com/files/1e49f614-7918-475b-abd7-4e8ed5cdabf5/how_to_make_an_inglenook_fireplace.pdf
    • http://pitolujebenim.epizy.com/46282077474.pdf
    • http://maduxefolus.epizy.com/roper_refrigerator_water_filter_location.pdf
    • https://uploads.strikinglycdn.com/files/923a3975-f634-4bd7-92d2-4262f0e86900/26637494629.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edda.bin
1fac8ba6a10290871a7142e137bf5e51b67882687b6cdf68655e69743b4ecfa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 5552 bytes
font_01_sfnt_off000100b2.bin
99431259c44c2bf389de10c740cf031be889e8125db3e584ad86859be51ce737		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 10656 bytes

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