Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0a910726f262cc…

MALICIOUS

PDF

77.8 KB Created: 2021-03-30 16:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d51042e9de5827ca577e3c0cecd9f2a SHA-1: 10dec37dfe9c3ffed1a47ca18b4354bc0089c5ee SHA-256: 5d0a910726f262ccf78fdcb45185c8d7c9f4c40c750b6bd10230e9ca06117956
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One prominent external URI, 'https://jumiwimov.ru/award?keyword=asme+section+viii+division+2+part+5+pdf', suggests a phishing or malware distribution attempt disguised as a search result. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=asme+section+viii+division+2+part+5+pdf
    • https://cdn-cms.f-static.net/uploads/4387573/normal_604d342882ad9.pdf
    • https://cdn-cms.f-static.net/uploads/4370299/normal_60320099bee77.pdf
    • https://cdn-cms.f-static.net/uploads/4366952/normal_605020d61e2a3.pdf
    • http://fegokodelaxen.scienceontheweb.net/baldur_s_gate_2_enhanced_edition_walkthrough.pdf
    • https://cdn-cms.f-static.net/uploads/4405899/normal_600b68b52b454.pdf
    • http://vinnipoh.space/88388363273dk0yj.pdf
    • http://sale-siberian-force.online/g_shock_mudman_3031_batteryhk19t.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gurupixabogivaz/65218577527.pdf
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_becdec8b049e49d9a2eb680bac962788.pdf?index=true
    • https://s3.amazonaws.com/meludav/acceptance_criteria_format_template.pdf
    • https://s3.amazonaws.com/remufuzu/49685257903.pdf
    • https://s3.amazonaws.com/muvazi/agneepath_movie_123mkv.pdf
    • http://vizomonuzujo.onlinewebshop.net/nopitit.pdf
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_021c144893d0474baabd5419ecddea66.pdf?index=true
    • https://s3.amazonaws.com/xugigabitulu/climate_change_in_australia_cluster_report.pdf
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_63760286474e40d79b4c872f78a16ddd.pdf?index=true
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_c6afe88fcbe84803b2971d4abcd13d5b.pdf?index=true
    • https://s3.amazonaws.com/mexesazaxasa/how_do_destructive_waves_affect_the_coast.pdf
    • http://vovakupalujum.onlinewebshop.net/keto_diet_sample_meal_plan.pdf
    • https://s3.amazonaws.com/safenalavojuwu/33929985350.pdf
    • https://s3.amazonaws.com/wiremeresegikon/thinking_maps_bridge_map_examples.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_off0000f0c5.bin
23e4b17d0e56356bf077afbdee17a1b676de2988510f7540148ab75ed596a987		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 5572 bytes
font_01_sfnt_off000103b7.bin
c06893a687246469675e80715889c32825eb68e5b3d3de5deee4afd224ee016e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 10628 bytes

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