Malicious PDF — malware analysis report

Static analysis result for SHA-256 0451318cffd22f8d…

MALICIOUS

PDF

69.1 KB Created: 2021-04-07 15:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f1892176ee8082d2cd853995cf6e9bfd SHA-1: bf80989fd138b2716992ab8d53d547c8121aca92 SHA-256: 0451318cffd22f8da93f59ceb965129ab4796be404ea2106103a8f93e522d2fc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent link pointing to 'jacksth.ru'. This heuristic, combined with ClamAV detection and ML classification, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'Jnt performance albion park rail nsw 2527', likely a lure to disguise the malicious intent.

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 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.
  • 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/123?utm_term=jnt+performance+albion+park+rail+nsw+2527 PDF link annotation
    • https://cdn.sqhk.co/rujamuzizogo/g4HweKN/carrefour_pass_app_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_601add90e216e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_606b85c5a5f0f.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/jc0geMX/84814571571.pdfIn PDF document text
    • https://cdn.sqhk.co/zaweniwefi/qgj7hcY/nifogofofe.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/fihwjiO/repulsed_by_my_husband.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/gjJRWJ0/wogejig.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/1cxjjjj/download_highway_wars_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/3WfjiYH/leap_movie_on_youtube_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_9113556e4f1843be99d9b2be6392f560.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/archaeological_resources_protection_act.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/13766280185.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/ace_personal_trainer_manual_5th_edition_audiobook.pdfIn PDF document text
    • https://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_11701a644c1e433caa584608ece95689.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopeteb/plantronics_voyager_edge_bluetooth_headset_schwarz.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/report_of_teaching_practice_experience.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/how_to_put_on_the_armor_of_god_by_mike_bennett.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/govezeron.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/35960007350.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_off0000d001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 5784 bytes
SHA-256: a8059442a594829e043e8194d006581abed812f17bfd5dd255b7072f59dedf1d
font_01_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 10324 bytes
SHA-256: b8ad096fbb698aa3f36d387ae19b4f6ae26221c7bc20f63b9d8cf367cbf4fbcc

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