Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afa4f76866adfc1…

MALICIOUS

PDF

160.7 KB Created: 2021-03-16 17:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a33bda4f76862a979f3bb4904b74f28e SHA-1: b0e3fb094bf897b838def9e0e24e63f800ff0848 SHA-256: 6afa4f76866adfc10c7b3c70240eb27ba3e9ccbc93b0336778aff8e38d9149cd
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of embedded URLs and the overall structure, combined with the heuristic firings, point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.NoRobot072136-9875398-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.NoRobot072136-9875398-0
  • 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://seumenha.ru/123?utm_term=ajanta+pharma+annual+report PDF link annotation
    • http://kitafoged.medianewsonline.com/tobodut.pdfIn PDF document text
    • https://cdn.sqhk.co/rujamuzizogo/iRjjZja/94430982928.pdfIn PDF document text
    • http://generalmassage.online/final_fantasy_16_release_ps5xnshr.pdfIn PDF document text
    • https://cdn.sqhk.co/xoradofexul/jjbgijh/elite_diamonds_for_ff_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/GkxX9ic/52795589096.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501995/normal_5ffd77a22b5e7.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/the_promise_of_a_pencil_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/5XHp3gc/brenda_fassie_memeza_album.pdfIn PDF document text
    • http://urro-hu.com/864889927234fi84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426820/normal_5fe3b044d452f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480736/normal_60241c0dddf8d.pdfIn PDF document text
    • http://matroskin.space/jkuat_admission_letter_2018k4w6d.pdfIn PDF document text
    • http://verenica.net/how_to_start_an_argumentative_essay_conclusionsxjlz.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/587958499639a1k2.pdfIn PDF document text
    • http://xufuzema.sportsontheweb.net/83070626593.pdfIn PDF document text
    • http://idem-peshkom.ru/cinderella_movie_2015_downloadh6kcl.pdfIn PDF document text
    • https://cdn.sqhk.co/rizikodeni/ZdEjbcc/75344931307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382418/normal_6031c9f72ebb8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/908e5b27-80ef-46c1-a61a-b9dbc779d14a/epson_wf_2630_cartridge_replacement.pdfIn PDF document text
    • http://pewubik.atwebpages.com/vakamuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00f8cae-ab33-4ba1-9723-640362865547/1252278835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a19938d9-dead-403a-a38a-07b9bdc6326f/soccer_techniques_for_5_year_olds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc05272-f628-401d-8edb-5b6bbe8989f6/78636096033.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_off00023c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C97 4944 bytes
SHA-256: 51654e6b12310adf9b55e6d0e6c164d16979df88e1e882d1862e5160f1eea643
font_01_sfnt_off00024d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24D40 11248 bytes
SHA-256: 5d02a44f7b6ce9357ea2a6ca93592b4cd059f084e53de6cda9eb09ee3c77588d

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