Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f6cb73309ebccb…

MALICIOUS

PDF

73.0 KB Created: 2021-02-24 11:38:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cf97c0b46db29d417b7ca8a8da01c332 SHA-1: 8a6a7870479205d134aa82c407cff928370d8fa0 SHA-256: 43f6cb73309ebccb75f5ddc27daa250c70acbc18f3a8e8721f58777e236bb04e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a search query, aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/aws?utm_term=how+do+i+use+my+black+and+decker+toaster+oven+air+fryer PDF link annotation
    • https://cdn.sqhk.co/nimuxugemu/hcSPUge/minecraft_pe_massive_village_seed_1._14.pdfIn PDF document text
    • http://widopomulagu.22web.org/48087057646.pdfIn PDF document text
    • http://fakereruzab.iblogger.org/learn_to_weld_course_uk.pdfIn PDF document text
    • http://zemimumaloger.iblogger.org/82140312998.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roginopirut.epizy.com/bumema.pdfIn PDF document text
    • http://nokigabexotuk.rf.gd/cancer_chemotherapy_drug_manual.pdfIn PDF document text
    • http://vonupov.epizy.com/the_power_of_now_chapter_8_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/55566087760.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/how_to_learn_epic_program.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/format_corrupted_sd_card_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/chhath_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/standard_equation_of_an_ellipse_worksheet.pdfIn PDF document text
    • http://duguzowosuli.epizy.com/31431430564.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/romeo_and_juliet_balcony_scene_sheet_music.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 5584 bytes
SHA-256: 09d79094cfd81432159d2da66a455baa6896f4693ee1689d26eb00c11f1a066f
font_01_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 10696 bytes
SHA-256: 6f251fddf527e6a25c1bc1425bdcf7bdf02a888fb5df45f964dcfa0e735a8fe9

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