Malicious PDF — malware analysis report

Static analysis result for SHA-256 b490b668e147b0ce…

MALICIOUS

PDF

66.3 KB Created: 2021-02-14 07:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 7d0c1ac5b466079bbf425b35fed05a0b SHA-1: 3658e47df9fdf786f322285f11a44306b9c986cc SHA-256: b490b668e147b0ce10a46b324538b3c41d47e5165c69e11247f72468bffbc6a9
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://maypoin.ru/wix?keyword=complex+fractions+and+unit+rates+ppt PDF link annotation
    • https://cdn.sqhk.co/suxavawudomo/Uihgihc/9441633226.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/hu8hd7Q/beat_the_boss_3_unblocked.pdfIn PDF document text
    • http://vvinorama.fun/3304592436tpiit.pdfIn PDF document text
    • https://cdn.sqhk.co/dorumexogik/X3npcgh/grumpy_cat_christmas_cast.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/44500811403hv92d.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/jsigPja/police_officer_costume_girl_diy.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/i5hdZUu/zixab.pdfIn PDF document text
    • https://cdn.sqhk.co/nimawabej/eQMxjjn/dreamline_flex_shower_door_installation_video.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/TdYGyij/king_s_raid_ishi_wo_tsugumono-_tachi_frey.pdfIn PDF document text
    • https://cdn.sqhk.co/gasariba/Mjjhhcu/digidesign_mbox_2_mini_driver_mac_mojave.pdfIn PDF document text
    • https://gepogujewo.weebly.com/uploads/1/3/1/3/131382217/wuvunomuviwudek_zorekuvazijubew_velijawiri.pdfIn PDF document text
    • http://bloomwithdeanna.com/monkey_types_for_petscyn0s.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/Ribgidl/41417560083.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/wunojipu/98720875136.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_off0000c6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DD 5272 bytes
SHA-256: c577d799097bacbe2a169e0068f2639a600979fa7f660b94579bb239522b3ec0
font_01_sfnt_off0000d8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B4 10368 bytes
SHA-256: 6abc56949af20ddb25137d844770850bbad5cdbc87243309656e5b975cf0fc1e