Malicious PDF — malware analysis report

Static analysis result for SHA-256 491d899650d031cd…

MALICIOUS

PDF

73.7 KB Created: 2021-02-14 17:29:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: fd2f123fd63ab930b61f79fb15f7fbb9 SHA-1: 86e4fb9b56aff4d22813c536dea31596644e9afb SHA-256: 491d899650d031cd44deff65d31be5f4b7e865d8e73bef7ccb298af8d1788fe8
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=the+things+they+carried+important+quotes+chapter+1 PDF link annotation
    • https://cdn.sqhk.co/buzomesil/hecTjfo/lathe_spindle_speed_formula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527357/normal_5fef5fe3cad34.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/3hbFieT/transmission_definition_waves.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/gdgcXQ6/obd2-_elm327_car_diagnostics.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/d5wMFgg/random_name_generator_for_among_us.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/durovi.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/dsvAVgj/battle_for_the_galaxy_mod_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392218/normal_5ffa8cab55b20.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/hihjegc/replika_levels_explained.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/tBhdIie/translate_web_page_to_english_mozilla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5fd615fb7e1e6.pdfIn PDF document text
    • https://betetaguzom.weebly.com/uploads/1/3/2/3/132303315/2878468.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413712/normal_5ff24785c1cee.pdfIn PDF document text
    • https://veminimuvaw.weebly.com/uploads/1/3/4/6/134630651/darovonelovex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kusegipe.epizy.com/71628464936.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_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 5684 bytes
SHA-256: 6d868cab0b2eb63c5c0fb447728aadf02134fa78b44bf995dd57650437905086
font_01_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 10072 bytes
SHA-256: 04e319cf7f57ec986f03cc435c4e263ad8a3564d02ea1ccdcbb7fbc6fc12ac1d

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