Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca15042758596242…

MALICIOUS

PDF

73.3 KB Created: 2021-03-25 05:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e9ad83e7afac9007429a193b92f973e3 SHA-1: 563bc19390d6d5aa0457ee1e9456af6d6a2fa722 SHA-256: ca15042758596242f7aab4a521943c7936eabd97af7530f4c4c5866f342fc910
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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=livre+barney+stinson+playbook+pdf PDF link annotation
    • https://najilemizosi.weebly.com/uploads/1/3/4/7/134730194/4265084.pdfIn PDF document text
    • http://instacopyrightcenter.com/muxixabadap9x2dd.pdfIn PDF document text
    • http://lisolu.org/kutejininodxagy4.pdfIn PDF document text
    • http://onlinekartiadesi.com/93921208342m8g5.pdfIn PDF document text
    • http://bufo.online/red_cross_72_hour_kit_listos9it.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380078/normal_5fcce24f7697e.pdfIn PDF document text
    • http://martakkord.ru/3170847261eaxln.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367278/normal_5ff59582e45e2.pdfIn PDF document text
    • http://konsalting.info/44446364774vmrel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496607/normal_5fedce60c3772.pdfIn PDF document text
    • http://znohist.site/how_to_clean_a_maytag_maxima_washer1dya9.pdfIn PDF document text
    • http://insitemonitoring.com/90321257989i17si.pdfIn PDF document text
    • https://nuramovu.weebly.com/uploads/1/3/4/3/134363108/669657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474752/normal_6009b4d2bdca8.pdfIn PDF document text
    • http://shoop-fk.ru/bahubali_movie_dhivara_song_ringtonez767a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_605bc174a91f4.pdfIn PDF document text
    • https://fixajunize.weebly.com/uploads/1/3/6/0/136051507/jawunolasusowep.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/belapawerezuju/29232254044.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/75285740027.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/shunt_trip_breaker_wiring_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/foul_play_ps4_trophy_guide_and_roadmap.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/lilusovexiru.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_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 5340 bytes
SHA-256: f11780b8a6d63e8c070fa618c022b7f701b4f7f558c56954e56e83c79cec549e
font_01_sfnt_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 12436 bytes
SHA-256: d59125530932c00d5e7ec9ddc6cb3ed2851f65d483f302fcc7dbc83d93f5b8fc

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