Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb9786401efed49…

MALICIOUS

PDF

70.5 KB Created: 2021-02-25 13:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 14128227bc017f4eee6817d33c252b23 SHA-1: 10136be72468e191ef6350b6759529c0041076f3 SHA-256: dfb9786401efed4925182797e93f4a59aaebbba88cd50168a60eaea46874a903
196 Risk Score

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.
  • 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://jacksth.ru/award?keyword=nikon+af-s+dx+55-200mm+vr+ii PDF link annotation
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/welagovodezoner-wefipakud.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/solito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494673/normal_5fff09b87cbac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5fd101c7bfa46.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/ljb3C3t/becoming_a_sub_teacher_in_texas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368246/normal_6000729073595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373997/normal_5fef3f2d48153.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/fakuguvil/community_service_sheet_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/el_clima_en_chiriguanos_formosa.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/buzzer_wav_file_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/59338969305.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/texas_engineering_ethics_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/sports_tv_guide_foxtel.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_off0000c897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC897 5612 bytes
SHA-256: a7040e20bbd0b47779e33fcf267a4d9b452bd353e56df8f1a50cb01c222bda71
font_01_sfnt_off0000dbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 15932 bytes
SHA-256: b597dfc98b50236b4dc30ea9ab7582092c89258dc010543058e873694aa84b37