Malicious PDF — malware analysis report

Static analysis result for SHA-256 d786efec12081109…

MALICIOUS

PDF

69.5 KB Created: 2021-02-13 03:09:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 254df69518e0179242684997fd18b3a8 SHA-1: db67087f570c57f1d8b38df416379be0a9f53894 SHA-256: d786efec120811094c4612a41da08d29fbd1999df5bba81b5aecd1707636a6e2
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://baarspo.ru/wix?keyword=cool+math+games+b+cubed PDF link annotation
    • https://xamikike.weebly.com/uploads/1/3/1/4/131406211/bf02c.pdfIn PDF document text
    • https://fafamamijusoma.weebly.com/uploads/1/3/4/3/134371196/jesanuxukit-nudigodafamuza-peragapapero-gamavoxexesom.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/jiCgjhu/21562878661.pdfIn PDF document text
    • https://mokegeninu.weebly.com/uploads/1/3/4/0/134017711/rufifilosasivugatesi.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/hbjchhH/bike_racing_2019.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/naxizugenabi/logevamuwawegatetakuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/android_api_file.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/xowegetamokojofapovoze.pdfIn PDF document text
    • http://pamilov.epizy.com/gefedivivezifura.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/transitive_and_intransitive_verb_quiz_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/88829657157.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/analise_combinatoria_resumo.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/tilijufabidirusimuponujaz.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_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 5304 bytes
SHA-256: 5cf651bc28abfb117f50dd66576a83336acf28ee7a03d2bf4ab4033e28d11eef
font_01_sfnt_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 10260 bytes
SHA-256: 920bacbdd78381dfd94e33d77fa900c5fbaf12791bb0ce05168cbc481cdd8212