Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc85013e42f86ff9…

MALICIOUS

PDF

78.6 KB Created: 2021-05-06 18:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa919502166102d7ffed841b09640711 SHA-1: 293439d685608e30433d4b3124fea7006e937b20 SHA-256: bc85013e42f86ff94cf762ce146d22005d0cb7a859fdde90b9d26fc397e2c4d2
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL points to 'zajinet.ru', which is likely a phishing or malware distribution site. The document body, though partially corrupted, contains text related to 'top down design' and the wkhtmltopdf application, suggesting a potential lure to disguise the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/strik?utm_term=what+is+the+top+down+design
    • https://cdn.sqhk.co/retesixabe/fWcAkgg/w3schools_php_session.pdf
    • https://cdn.sqhk.co/wizokawoxo/jjOrb6T/larowekufinuvefadujux.pdf
    • https://cdn.sqhk.co/gunakawujo/Zhjohhf/97318109805.pdf
    • https://cdn.sqhk.co/koroxofusino/B6jahjk/frantic_synonym_words.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jinotugiwomo/amasijos_colombianos.pdf
    • https://uploads.strikinglycdn.com/files/60eef3f9-5ac5-465d-8920-e3028c88ce99/how_to_save_project_on_imovie.pdf
    • https://uploads.strikinglycdn.com/files/464aee45-6ae9-478e-9d28-aff6de93c681/air_force_academy_female_percentage.pdf
    • https://uploads.strikinglycdn.com/files/60726967-1e69-42ff-a340-f9815aa8d57e/honeywell_portable_wireless_doorbell__push_button.pdf
    • https://s3.amazonaws.com/juzowilipi/article_15_full_movie_free_filmyzilla.pdf
    • https://uploads.strikinglycdn.com/files/77813db6-34fc-4f6f-b6a7-610e06a025de/how_to_use_google_maps_offline_without_data_or_wifi.pdf
    • https://s3.amazonaws.com/zamuriza/chrome_application_for_laptop.pdf
    • https://uploads.strikinglycdn.com/files/a0ad70b2-046b-4c23-8261-69d4ebc4c315/41214952477.pdf
    • https://s3.amazonaws.com/gajabedafot/envelope_design_template.pdf
    • https://s3.amazonaws.com/tumuzu/thermolyne_furnace_manual.pdf
    • https://s3.amazonaws.com/numegubowalonan/rejesododefe.pdf
    • https://uploads.strikinglycdn.com/files/15ad4347-bd38-46a5-bf29-7d842e1200fd/pride_and_prejudice_chapter_1-11_summary.pdf
    • https://uploads.strikinglycdn.com/files/29c87990-3763-4464-a1ad-097bd3893507/how_to_start_fantasy_basketball_draft.pdf
    • https://s3.amazonaws.com/zuniverijesud/2001_toyota_corolla_stereo_wiring_diagram.pdf
    • https://uploads.strikinglycdn.com/files/1d63e2cc-7691-43eb-9863-90ab8990bf78/vuterugusojinipuzawag.pdf
    • https://uploads.strikinglycdn.com/files/26816b2f-0bff-4ec5-9dd3-3a46dd413e19/konatexep.pdf
    • https://uploads.strikinglycdn.com/files/cd3cefa5-2907-4a6a-a3ce-e86ccec873a1/6718698862.pdf
    • https://s3.amazonaws.com/natewared/a_discovery_of_witches_season_2_episodes.pdf
    • https://s3.amazonaws.com/levumoduf/vidmate_app_in_apkpure.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_off0000f6f5.bin
41e2acee119fd441eface802d53b307ce1629391754caa7eae07a2678e813026		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 5196 bytes
font_01_sfnt_off000108bf.bin
638c973217bb1c9db51ca7956b8791492aaa0c0351a8984e59b6ce8d3d854078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 10828 bytes

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