Malicious PDF — malware analysis report

Static analysis result for SHA-256 781a81fd1f598212…

MALICIOUS

PDF

73.1 KB Created: 2021-03-01 00:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 4539dc8d2d2148abe3cd361d0ba4ecc5 SHA-1: eea2e4cc5b28e0d2d761d9a6edb48e6b7d45817c SHA-256: 781a81fd1f598212a3bb1da573fe2558e79bd5299c9c67fc00ddcd58ebd83cf1
254 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wb?keyword=kindle%20basic%203%20specs In PDF document text
    • https://vewavuxusiwidew.weebly.com/uploads/1/3/4/5/134587075/14ac35.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/hyundai_sonata_embera_maintenance_cost.pdfIn PDF document text
    • https://werikaduf.weebly.com/uploads/1/3/4/4/134483952/61fad77d2f468e.pdfIn PDF document text
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/9041356.pdfIn PDF document text
    • https://manatelagaren.weebly.com/uploads/1/3/1/4/131437493/fixogabiwu.pdfIn PDF document text
    • http://bioforcecolumbia.site/boganitarodabajasa82keb.pdfIn PDF document text
    • http://songkfrk.site/levers_and_pulleys_worksheetkdic9.pdfIn PDF document text
    • https://lufojujerap.weebly.com/uploads/1/3/4/4/134481619/wojodon_tisaloromal_besorexigoz_turavojupokerat.pdfIn PDF document text
    • https://pixasowurixes.weebly.com/uploads/1/3/4/9/134904492/149475.pdfIn PDF document text
    • http://freud.icu/game_asphalt_7_jar_240x320qdx39.pdfIn PDF document text
    • https://zojipulororasa.weebly.com/uploads/1/3/6/0/136011419/03472b5bc1f.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/lezerawe/calorimetry_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/hawkes_learning_discovering_statistics_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/blood_pressure_chart_template_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/firefox_web_browser_for_android_tv.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_off0000e2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 5244 bytes
SHA-256: fdb4ee6dbc84e7aae9b934a9a30aaba1a41b56083e6371748c5261790b61bbaf
font_01_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 10372 bytes
SHA-256: 2217b825db3d1c1469010c9957fc07039ea51ed42c13ede7dad283ccb12ba727

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