Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3331fb5779befcb…

MALICIOUS

PDF

82.5 KB Created: 2021-06-01 08:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6cef8923feaa49100df78d37e85190dc SHA-1: a7183c174b0e042085e032024ad1822be096262f SHA-256: f3331fb5779befcb83d70e13c182b9d4f489fefa80f09cf946949243f82d8a4e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://medvor.ru/pbw?utm_term=geni%25C5%259F+%25C3%25B6zet+%25C3%25A7%25C4%25B1karma+program%25C4%25B1 PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemulopawed.pbworks.com/f/gumali.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/f/16853310401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4764c23-3195-4b12-b456-f604582f267e/how_to_cure_my_masterbuilt_electric_smoker.pdfIn PDF document text
    • http://naxoxututal.pbworks.com/w/file/fetch/144444909/kuminokitekobawokasalix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/831c533a-7f86-4a71-bbe7-6505333274de/peace_offering_meaning.pdfIn PDF document text
    • http://supijexed.pbworks.com/w/file/fetch/144447120/11418926821.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/adobe_acrobat_x_pro_serial_number_list.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144411744/modunipe.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/m3_data_recovery_full_crack_kuyhaa.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/pokemon_gba_games_on_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b10e059a-55ab-457c-ac67-779f33d52854/19252139751.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/tabla_de_equivalencias_de_unidades_del_sistema_internacional.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee48f8c-1ba5-445b-840f-7c769dd6c896/benogosativ.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/el_libro_del_diablo_pelicula.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144442740/how_to_install_lg_stackable_washer_dryer.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/55510651300.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/how_to_make_a_paper_airplane_best_for_distance.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144445866/35827159339.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_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 5672 bytes
SHA-256: 287560b362e1375683ecbd9340d9960a000dc4159ab15e594319c22c840954f4
font_01_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 13084 bytes
SHA-256: e82308bbcdd9957380cf0882cdea12bf842dfbbef1b023d113ccc1fa258aa2ee

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