Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf75f6d9f401d1a…

MALICIOUS

PDF

69.6 KB Created: 2021-02-28 12:05:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0e365cfb2b29d563ea715bf6cb2b5eda SHA-1: 84f6e7f13a475111c61b6613ed7dd9dbd1dd135f SHA-256: dcf75f6d9f401d1a029a892eb9c1fdc786edcc7b9ba65101fbc4eb2286e66ca8
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though partially corrupted, contains text related to downloading a book, which aligns with the external URLs. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://maypoin.ru/wix?keyword=biblia+de+referencia+thompson+pdf+descargar PDF link annotation
    • http://keligekixebar.22web.org/galvanised_mesh_sheet_sizes.pdfIn PDF document text
    • http://intekzafast.online/what_is_the_volume_of_the_pyramid_8fykql2.pdfIn PDF document text
    • https://risenezapaf.weebly.com/uploads/1/3/4/4/134481661/batesetigenajuze.pdfIn PDF document text
    • http://kinokaiff.space/48537392822aavs3.pdfIn PDF document text
    • https://baxukeze.weebly.com/uploads/1/3/0/8/130874478/nowofapuwederarupo.pdfIn PDF document text
    • https://milelujip.weebly.com/uploads/1/3/4/8/134861654/duvimebisuv.pdfIn PDF document text
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/3115951.pdfIn PDF document text
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/2812824.pdfIn PDF document text
    • http://snapchat-alert.com/can_i_transfer_pictures_from_my_iphone_to_a_digital_picture_framerkgvb.pdfIn PDF document text
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/panole_suzanawedu.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/1f53741fc9cc.pdfIn PDF document text
    • http://seamanygau.best/manual_de_carreo_para_nios_amazonpi0ze.pdfIn PDF document text
    • http://alifan.store/jack_and_the_beanstalk_story1a9hw.pdfIn PDF document text
    • https://falijufik.weebly.com/uploads/1/3/5/3/135349852/xatovatupeginiv.pdfIn PDF document text
    • https://xududegugi.weebly.com/uploads/1/3/1/6/131636960/8940253.pdfIn PDF document text
    • http://tukameduk.22web.org/40270389641.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://benepiro.rf.gd/show_me_all_the_magic_tree_house_books.pdfIn PDF document text
    • http://votitagupen.epizy.com/free_software_kamus_bahasa_arab-_indonesia_lengkap.pdfIn PDF document text
    • http://nuforikoxiv.epizy.com/tuba_c_major_scale_finger_chart.pdfIn PDF document text
    • http://vepilezora.epizy.com/5121161004.pdfIn PDF document text
    • http://gavativu.epizy.com/tipebewutar.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_off0000d124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD124 5760 bytes
SHA-256: f39559ff008a26790e62cd709b577a1e2e6ffca25454431c9288320e026e71d0
font_01_sfnt_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 10672 bytes
SHA-256: ad8200e12df83ec657c700ed065c824d7fd6608302b0e1f8d336ecd5b27aeeaf

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