Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98b7fbd9bf59f78…

MALICIOUS

PDF

78.1 KB Created: 2021-03-30 21:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d45f914dcb8a78c3df31b3041a1cef16 SHA-1: b5a4df82209aeb2e848766eef28ea5cca0770fff SHA-256: e98b7fbd9bf59f78ae3c1c7816d7ff84337557693089127ef38336d1ab05960d
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'jacksth.ru' with a 'forklift training courses' query parameter suggests a phishing or social engineering lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=forklift+training+courses+melbourne
    • https://static.s123-cdn-static.com/uploads/4467019/normal_6004a1e1e679a.pdf
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/soxijifuw_natifarakivegew_tijorip.pdf
    • http://lavka-karamel.ru/371952809260d58i.pdf
    • https://static.s123-cdn-static.com/uploads/4405195/normal_5fde8f8b22ca8.pdf
    • http://copyright-helps-team.com/tetujupibolipabumomedokqrf35.pdf
    • https://boboxike.weebly.com/uploads/1/3/2/7/132710801/jodukozele_xovivugidiwo_dudon_jomujujol.pdf
    • http://casbah2point0.com/mimpi_hamil_anak_perempuan_kembarcs8p1.pdf
    • http://ledimpress.biz/bundesliga_league_table_and_form1tw5g.pdf
    • https://nejaxadutoxukax.weebly.com/uploads/1/3/4/6/134622523/2041344.pdf
    • http://abreudesigns.com/appcelerator_titanium_studio_for_mac4fm6t.pdf
    • https://cdn-cms.f-static.net/uploads/4370302/normal_605945a23fdf2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/455e5904-8345-45de-a32e-68e75d303283/46415914925.pdf
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_fc0e44997f5d4ff4b26b25dcc8c14ac0.pdf?index=true
    • http://wopolew.rf.gd/bahubali_film_video.pdf
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_bcde6fd178d24bcc820fa3777d9331bc.pdf?index=true
    • http://dojirezanis.epizy.com/report_fly_tipping_darwen.pdf
    • https://uploads.strikinglycdn.com/files/f62b70d6-ac14-4d43-8a8b-fe90c58525f8/wisdom_for_mothers_book.pdf
    • https://uploads.strikinglycdn.com/files/f544b572-faf5-4457-be28-472bf11c7908/57602824882.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_off0000f2a4.bin
f5c072225febbabbc94583aa272ee28c63a6fe47679a7bd9c2d52c6cd9dd9aee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 5360 bytes
font_01_sfnt_off000104d8.bin
2b4ddb3602822569524b01178badf765973fbc92a8068171e6371f96eae8ee37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 11076 bytes

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