Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7caef3647bf480d…

MALICIOUS

PDF

67.3 KB Created: 2021-02-07 17:13:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: f63a3b5e81b1194504ab6f6d89e0e302 SHA-1: f1beaf8e407ff94188621db27417bc5753808d07 SHA-256: b7caef3647bf480dc7e2143a2d7090afc533e804c6fb00529400f84450c04ebb
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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/aws?utm_term=my+grammar+lab+c1%252F+c2+answers PDF link annotation
    • https://piwifagipob.weebly.com/uploads/1/3/1/3/131379899/tejilesozujekixas.pdfIn PDF document text
    • https://dorakipep.weebly.com/uploads/1/3/4/7/134747047/8545197.pdfIn PDF document text
    • https://rerijore.weebly.com/uploads/1/3/1/8/131856643/limozuges_meduxukurupi_jijowosejodukoj.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/4KqE8ji/ninja_foodi_grill_accessories_roasting_rack.pdfIn PDF document text
    • https://moxigowa.weebly.com/uploads/1/3/0/8/130814106/5500f2.pdfIn PDF document text
    • https://putoxovomugov.weebly.com/uploads/1/3/0/7/130739063/672195.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/mozuxasanifud-nabudovega-kutikabaniwixos.pdfIn PDF document text
    • http://beautysss.site/17038474864de3bw.pdfIn PDF document text
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/5e83b857929.pdfIn PDF document text
    • http://garirixis.22web.org/ravujovixofififunimaf.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/davawina/17988213672.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/video_from_blob_url_javascript.pdfIn PDF document text
    • http://zifixatef.rf.gd/71398537733.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/comment_avoir_confiance_en_soi_meme.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/avengers_a_day_game.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_off0000c8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FD 5676 bytes
SHA-256: 0c2ed05fd808d0f64034ae906ce9fe84dbb15e5e96fe17e4f96807075ff85356
font_01_sfnt_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 10616 bytes
SHA-256: ba3f047b446b0390d078dcac357633f5c4812e122c1b4be11f5ea959d5c44bb4