Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8ffd89c13d7076…

MALICIOUS

PDF

80.6 KB Created: 2021-05-18 17:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0b857c2e1de27333e78167dd98d7184c SHA-1: c3cffa96b95d05dd7bb3ac14c83027b5ce7b3fb3 SHA-256: eb8ffd89c13d7076cac7d6b6f229e4c6f8ec7014b7551819401c265ea0d17417
126 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. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=florida+written+drivers+test+study+guide PDF link annotation
    • http://vasezasu.22web.org/feedback_form_for_parents_workshop.pdfIn PDF document text
    • http://vonokumi.iblogger.org/52731923214.pdfIn PDF document text
    • http://givupuxorow.iblogger.org/vujuzetugupipavatut.pdfIn PDF document text
    • http://tufataf.22web.org/aadhar_card_maker_software.pdfIn PDF document text
    • http://guwejusu.22web.org/gejulolusit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f99459-b1db-494c-946f-cb2426f786ad/tarojolebubomomu.pdfIn PDF document text
    • http://pamovoxe.rf.gd/34708592792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c51d861-81eb-4726-9068-d76ad876f74d/how_to_politely_decline_network_marketing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f137c46-ef76-4aba-a82b-b4dcccce0a61/79307061698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a1505d-d375-4e6d-9cbc-d66fc999ece4/wajujep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445fc5ad-fd70-4537-a7e7-2ba22868019e/the_seven_basic_plots_christopher_booker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c58ffc-c84f-47f6-a6be-5fc242b75d36/63573741345.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/38169308973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f72221b2-60ca-4db0-86b0-b4b428e657d9/wobif.pdfIn PDF document text
    • http://botemexake.rf.gd/82775250695.pdfIn PDF document text
    • http://wirizobesopo.epizy.com/kick_the_buddy_game_hack_mod.pdfIn PDF document text
    • http://wesovipimamino.epizy.com/28157540022.pdfIn PDF document text
    • http://furalepoju.rf.gd/65559643340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85a9112-5995-4105-8720-6d2238c67785/7986335222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1453a85d-7531-43ec-af11-575943c93ac8/pudujerapijixanine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf63479-ad63-45d0-bbfc-8e2ab9a78489/gizasavimepevakuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f73df144-d9d9-4e1e-955f-bf19eec03712/jatifofimigi.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/31731152535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7b3956-d055-4500-849d-1b3af7aade7e/boy_scout_wood_carving_merit_badge_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40f4fb29-76df-49de-97eb-72ab0eb45be8/mevotunigijamopapow.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_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 5200 bytes
SHA-256: b72fe6774f0670eeb8ab919da55927ff20ac0cc1d39499d9f37d9bab13564554
font_01_sfnt_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 11308 bytes
SHA-256: 56d2bf43d5e05a7029eb333abda1b9118c0dad5772d8b480dcf181e304ba5b9b