Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca5b24d0b35195a…

MALICIOUS

PDF

84.4 KB Created: 2021-04-08 06:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b499cbd28f72e8cf50c558b49a8b8b0 SHA-1: df724ed0e7042775e12caaf302e57150d93e8e3c SHA-256: 8ca5b24d0b35195a6e178b1bda3dd817f03835a7d5b320744dc3a616b6bc4d18
96 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, one of which is presented as a search result for a book. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=into+the+wild+jon+krakauer+pdf
    • http://lazisirogabidir.mypressonline.com/difference_between_reducing_and_nonreducing_sugar.pdf
    • http://raisinshub.pro/mugaxomisesinitoragepil8s9m5.pdf
    • https://cdn.sqhk.co/sovokeduseb/ijdbLa6/kekavopafivulusixebak.pdf
    • https://cdn.sqhk.co/zunezafi/Rgcibhd/space_sandbox_games_free.pdf
    • https://cdn.sqhk.co/fejovuwov/idjbD2I/sezafodin.pdf
    • http://betomarajenede.iblogger.org/nejozumisoviwoviwaral.pdf
    • http://mekujoviwe.mypressonline.com/phonemes_and_allophones_in_english.pdf
    • http://viwafuxofiseko.getenjoyment.net/antrenmanlarla_geometri_2._kitap.pdf
    • https://cdn.sqhk.co/terasovo/IniiILW/jojawuzofipaligefara.pdf
    • http://sujimelowakolop.medianewsonline.com/69138787208.pdf
    • https://cdn.sqhk.co/bepifopid/5hiigfT/82414690086.pdf
    • https://cdn.sqhk.co/pixorikibam/iedidQB/teacher_assistant_resume_australia.pdf
    • http://cparta.moscow/376386640098vzvd.pdf
    • https://cdn.sqhk.co/buvaboda/jaTygcu/gases_properties_chemistry_gas_laws_worksheet.pdf
    • https://cdn.sqhk.co/welosezu/ngg1hfn/texexudegukodowutorujojuw.pdf
    • https://cdn.sqhk.co/loganidob/IKiaid9/duzazoxigun.pdf
    • https://cdn.sqhk.co/reteletofi/zBRgfhc/sinujorukusajosipeted.pdf
    • https://cdn.sqhk.co/turaxulefa/cgDhemC/wafawewopa.pdf
    • http://fewutame.getenjoyment.net/32378915120.pdf
    • http://5-euro.info/vesuzonokxg5p1.pdf
    • https://cdn.sqhk.co/disanefamu/iqgczhh/bacon_the_game_online_unblocked.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lamupilabixekuw.epizy.com/revunexojumoregatover.pdf
    • http://riwusuka.epizy.com/71666250270.pdf
    • http://tibuwol.rf.gd/reading_board_games.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_off000107b9.bin
e2e3c00ad041c150c53ec63080eaa504b7e41242a69732f08dca8a4ac1f5572b
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 5120 bytes
font_01_sfnt_off00011931.bin
dc8b14cb92a3eb60e88f60629371f2939fe0455c991c6da350e198a13a9bbc7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 12940 bytes