Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d6f29aea76af87…

MALICIOUS

PDF

101.5 KB Created: 2021-03-21 06:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad5adf22b1e8b6588ca7741ab02cd1df SHA-1: 760285a3c94628ee052e5284d98591eadaa5db13 SHA-256: 24d6f29aea76af87e75527949e6bb0d476d1da05aa0db821d444724ca4a76d14
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, directing users to multiple external PDF files, one of which is hosted on a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://lozipotod.ru/wix?keyword=drive+a+word+whizzle+answers+african+countries
    • https://rijozixofufake.weebly.com/uploads/1/3/4/5/134509282/finiviw.pdf
    • https://cdn.sqhk.co/vimerokil/jbNKNgg/39770148914.pdf
    • http://nokasosozigof.mypressonline.com/36721990039.pdf
    • https://cdn.sqhk.co/sedazozesufu/gdicIjb/discovery_neon_glow_drawing_board.pdf
    • https://cdn.sqhk.co/gabamulijawe/cgdyhcX/dessert_recipes_dairy_and_egg_free.pdf
    • https://cdn.sqhk.co/tosilura/6GdieuE/90748808191.pdf
    • https://metenesepagozo.weebly.com/uploads/1/3/4/7/134710396/330430.pdf
    • https://dubelaxelafef.weebly.com/uploads/1/3/1/1/131164372/268032778.pdf
    • https://vidolatukala.weebly.com/uploads/1/3/5/3/135316506/9519056.pdf
    • http://kusukeluwabe.mywebcommunity.org/python_programming_for_beginners_book.pdf
    • https://wokoxulepimam.weebly.com/uploads/1/3/1/4/131438011/d16112.pdf
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/3d6fd2acb.pdf
    • https://cdn.sqhk.co/duvapegoleva/hbIZjc2/allegiant_flight_status_sarasota.pdf
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/napuziw_dozowolin_sejuketavow.pdf
    • https://kemumapuvepuvi.weebly.com/uploads/1/3/4/3/134311950/sigesoferas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_3390c75fbee24ffeafb88c45f249ff01.pdf?index=true
    • https://s3.amazonaws.com/jinabisura/tesunulazezefulabeladaku.pdf
    • http://kifesafijupesob.onlinewebshop.net/weragejomezo.pdf
    • https://s3.amazonaws.com/wutogugej/nfl_injury_report_sunday_night_football.pdf
    • https://s3.amazonaws.com/zerepuzuze/archero_mod_android_republic.pdf
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_ce60718cbab342218c0b07c59ae5f52d.pdf?index=true
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_89486d9a84d04e5990cbdf3763448183.pdf?index=true
    • https://s3.amazonaws.com/wujapu/gopidajaramin.pdf
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_1bd6581e884b414bbdb3bb3d7b2b8026.pdf?index=true
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_b0471f13af5548c4b1dd63d9cfd44d6a.pdf?index=true
    • https://s3.amazonaws.com/sewamos/avatar_movie_images.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_off000150a6.bin
81fc4e9d611392fbe4f2c6cca98a08413489fb2c756a1256dd3acdbbb0e22e0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150A6 5308 bytes
font_01_sfnt_off000162d9.bin
085ca362f8b5bf88ef348cadd6048705bfb2004d82d112ccb452c850dfb167d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162D9 10420 bytes

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