Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0b3d7dbd645e09…

MALICIOUS

PDF

83.5 KB Created: 2021-04-01 05:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a0a6174dc2ef72da4b5435bcc268d46a SHA-1: 5b816ccecb52f5cb91d110e8d29812c9a72c8c89 SHA-256: 8d0b3d7dbd645e0901312b65c969d11737ae07a7e7bdd71b2847f20ad15aaa92
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jumiwimov.ru/strik?utm_term=eventide+h9+how+many+simultaneous+effects PDF link annotation
    • https://cdn.sqhk.co/fogunivugame/ggchcH5/decibel_meter_software_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/Sv4hdYM/hit_run_creative_hoboken_address.pdfIn PDF document text
    • https://gejejemimegi.weebly.com/uploads/1/3/4/8/134899280/7589752.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/yjijWQP/vixefabiromefelowi.pdfIn PDF document text
    • https://cdn.sqhk.co/bepifopid/s6ifMie/62525146504.pdfIn PDF document text
    • https://cdn.sqhk.co/zixajofazadi/tvjdRhi/arcade_machines_for_sale_michigan.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/lejatu-bozewuxuzuziko.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/f6LWhb4/british_talent_show_golden_buzzer_meaning.pdfIn PDF document text
    • http://noncomform.space/gaduvisakokonevapekud23xhx.pdfIn PDF document text
    • http://ujjjrrrrr.space/animated_explainer_video_templatesf7gh8.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/6amib9a/car_gear_shift_button_stuck.pdfIn PDF document text
    • http://degakak.sportsontheweb.net/fesipavisuxites.pdfIn PDF document text
    • http://zesenadozefut.sportsontheweb.net/survival_of_the_fittest_natural_selection_meaning.pdfIn PDF document text
    • http://ig-objectionform.com/software_testing_toolsqapfeb5.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/k51jjje/bowling_christmas_gifts.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/6phihjf/bluff_plus_zynga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/21bf3adc-a4e7-4e7a-9c11-4bcbcedc40fd/lotuz.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/vuzuxemuxakafoxawogikabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/573c2414-d795-47e2-a25b-58179ac94912/interior_design_app_iphone_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d5d0526-de4f-486c-b0e1-eb7464abe7b1/dungeons_and_dragons_5th_edition_new_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eff482c-43af-424c-b3e4-57444e0cfa88/minebopokikoxijiwev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac1b787-4193-4a04-8b09-cc51af013784/zolububawuxise.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 5412 bytes
SHA-256: 1ef705a626f73d45b375ba24d772812bed999be072419b23466e9500410aaa78
font_01_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 11592 bytes
SHA-256: f62513de6d8819a74f81f9faef9b78f86258bc42c8cadb5f195fd325e4535ade
font_02_sfnt_off00013096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13096 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e