Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4afaef0c79c0b0e…

MALICIOUS

PDF

72.7 KB Created: 2021-02-28 21:56:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 77f7bdfbbf87d6161da2ce27d784f0dc SHA-1: 02731341f0fabe60c3f8fc4f994efef165e808a6 SHA-256: c4afaef0c79c0b0e89b1beaa6051b52cedbf6c2107faf9ace286ff58850fb211
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://midufefew.ru/award?keyword=does+samsung+ks8000+support+dolby+vision PDF link annotation
    • https://cdn.sqhk.co/fuludasowipu/ygf0whf/empires_mobile_game.pdfIn PDF document text
    • https://cdn.sqhk.co/muresogus/iPjahju/kitajos.pdfIn PDF document text
    • https://cdn.sqhk.co/bovefonot/Gggpyhh/56465419736.pdfIn PDF document text
    • https://cdn.sqhk.co/wolowivem/arifn8b/rokugepikerap.pdfIn PDF document text
    • https://cdn.sqhk.co/fonixoligem/NHhdHhe/sudoku_online_easy_9x9.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/bilubarewef-bokakonu-jagadarapej-tinogufibipen.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/XgEyKjQ/83874498532.pdfIn PDF document text
    • https://cdn.sqhk.co/xafigozenusu/ZhiC2UY/sing-_magic_karaoke_free_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/gZhc0MT/silver_cloud_inn_mukilteo_breakfast.pdfIn PDF document text
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/1d61591093fe3c.pdfIn PDF document text
    • https://fumeseteno.weebly.com/uploads/1/3/1/4/131483149/sopimo.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/kubafezin/phonetics_exercises_with_answers_online.pdfIn PDF document text
    • http://tewamenuve.rf.gd/the_dark_science_of_logical_fallacies.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/76777870793.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/estimation_worksheet_for_grade_5.pdfIn PDF document text
    • http://duxurulokij.epizy.com/47334864241.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/pokuradejuzurisatid.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_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 5980 bytes
SHA-256: 7b367a6e5cc3ad779c8d3cc943192ed79730b0e6f0d2b96e7a00f6a875502261
font_01_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 10240 bytes
SHA-256: 37693d3dfad7f53e21e36a2cd877c9a3ee3d5f32c011970f83d8862e35d386d9

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