Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb43e65ab37137d4…

MALICIOUS

PDF

62.2 KB Created: 2021-02-10 20:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 3654d4100cf4f4254f7330e3a82c8e91 SHA-1: d4ed405d6370aa7ef4762eabbf85ace0aa47e1da SHA-256: cb43e65ab37137d499ba94b29199e5c541f20ffef2d66a0b0379def45a9cff90
196 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
  • 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://leonvi.ru/123?utm_term=advantages+and+disadvantages+of+life+insurance PDF link annotation
    • https://cdn.sqhk.co/mekaxosur/5DGlyan/bronze_age_chronology_in_the_carpathian_basin.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/cijhfmb/52172519346.pdfIn PDF document text
    • https://metojonokodoto.weebly.com/uploads/1/3/4/8/134881876/5057207.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/ggjejiZ/teachers_union_california_propositions.pdfIn PDF document text
    • http://dnepr24.info/medical_tourism_guideghexu.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/gjggVif/14820221118.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/ieWhiZf/puroxaja.pdfIn PDF document text
    • http://netewe9.xyz/med_surg_clinical_companionln6ce.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/djioaig/warrior_cats_amino_bio_template.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/Ajdhiel/mx_player_apk_free_download_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/cheh4ig/dosimiweza.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/bagisi/sql_server_2014_version_12._0.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/coming_soon_page_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/nisitoli.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/97978053420.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_off0000b73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73B 5236 bytes
SHA-256: 4b210be196791708a99d2670a33a91fc3ff36086b9b8ea5943a525398e0f0f47
font_01_sfnt_off0000c928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC928 10064 bytes
SHA-256: b4b3f0b99d5e4ceb2c9c4739018284ecff10f3593e9f6064f9c7fab8c6d2969d