Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba4daa5bcb85810…

MALICIOUS

PDF

79.1 KB Created: 2021-04-06 08:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 01e13120ba410a7f06df494c29022952 SHA-1: 22c230ef1bd387848f1b2d5bc1bb92215ef7f26b SHA-256: 8ba4daa5bcb85810280a2229f16c0affa5dac5acdb2c250545efeb3eedd417c3
136 Risk Score

Malware Insights

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

The PDF document contains a heuristic indicating it's a lure for free downloads, directing users to an external redirector URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing tactic.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://lozipotod.ru/strik?utm_term=is+outlander+available+on+netflix PDF link annotation
    • https://cdn.sqhk.co/towevefizub/navigqS/air_force_fighter_jets_top_speed.pdfIn PDF document text
    • http://graatorama.fun/how_to_knit_mens_socks_for_beginnerse0cyr.pdfIn PDF document text
    • http://bizifemodefi.mygamesonline.org/weightlifting_training_program.pdfIn PDF document text
    • https://cdn.sqhk.co/xidujefonari/eMhhgcG/rijazixediwarumek.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/jkgjghf/wozerijedulodef.pdfIn PDF document text
    • http://kukushpa.fun/97582886596d3a3p.pdfIn PDF document text
    • http://benivosefemiza.medianewsonline.com/52588376278.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/how_to_get_more_spell_slots_in_dark_souls_3z3whp.pdfIn PDF document text
    • http://goossyy.online/comptia_a_practice_test_answerso51qu.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/sovexaxanop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liwafo/wifakerexav.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/laravel_form_builder_select_multiple.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/is_taping_good_for_plantar_fasciitis.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/zaroterufura.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/70526961379.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/nerega.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/71258959968.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/jamusobifudotakuzevut.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/ikea_nutid_oven_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/report_writing_on_eye_check_up_camp.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/himno_nacional_mexicano_en_otomi_letra_completo.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/womorivowe.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/34115756651.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_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 5104 bytes
SHA-256: d3d582503fb0826703b8f9f37be16e16592172122d4cb74018fff5a26fdca40b
font_01_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 11288 bytes
SHA-256: d34e88f882d8468cb0cffbf3daaf9c7163cf948556805ef306229f83f5fc274b

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