Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c46388979edb035…

MALICIOUS

PDF

68.6 KB Created: 2021-02-16 05:36:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 71be07c643d9565de5eb9588f32f4c78 SHA-1: 2717f430ce5a9643a2f9562a4f8cfa3f79cfe6c6 SHA-256: 8c46388979edb035d2b9491f48e461d8c059fa83a350f4f492491e345b20cb76
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://druttle.ru/wix?keyword=vocabulary+workshop+level+b+unit+7-9+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451221/normal_600eb89f2c1cc.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/iehgHhi/roxeviziwapinojuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzalolotagi/sAhbcCZ/happy_teachers_day_greeting_card_easy.pdfIn PDF document text
    • https://zemedabumudog.weebly.com/uploads/1/3/2/7/132712209/022148d0.pdfIn PDF document text
    • https://cdn.sqhk.co/fomezawelud/iiHyjiT/10233640265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494138/normal_601c7a31cb967.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/hS8hdEw/gomobejinisu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366947/normal_5fedc10eb2fe4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_5fd2a463c12bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426267/normal_5ff4a9e6cfcbc.pdfIn PDF document text
    • https://cdn.sqhk.co/pabulibig/1Fijnqx/digikey_electronics_locations.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/tiniruru/bejaxarejevefomuso.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/posesixizewodisomatifi.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/free_algebraic_expression_worksheets-_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/zabonopugigojimidadupaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/51271350330.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_off0000cf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3D 5712 bytes
SHA-256: 7148e8faf14122a4855b5fbc19e77e7b32398ae3bd493e0b9eea55d817b14956
font_01_sfnt_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 10016 bytes
SHA-256: 87169a2fdfca8c8cad0ca99193ce346f2aaa33c8a2feb6f5e024fa851bfbca89

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