Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1caf9ad4a26b44…

MALICIOUS

PDF

68.4 KB Created: 2021-01-30 19:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: bb8c5ef77311209c7e075b081e52e73d SHA-1: 9c82a8dd619e31c57c9108c669aa0536c8a39a07 SHA-256: 4b1caf9ad4a26b449c3e401b5893dcfdc165cc07b8b2130b8b96bcd7fc572160
236 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://bologen.ru/aws?utm_term=activator+windows+10+gratis PDF link annotation
    • https://cdn.sqhk.co/joxesinejag/giejagc/24433437425.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/losepeb-sobavegeg-fikasotadiwifa-zabam.pdfIn PDF document text
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/2d9d32e109.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413002/normal_6003c435ea331.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/whiRQij/87699017933.pdfIn PDF document text
    • https://kodowukufu.weebly.com/uploads/1/3/1/4/131453871/fimufutafege.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/mefadedosuw/41519962351.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/wuxumoxoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/bismuth_steven_universe_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/full_cycle_accounts_payable_process.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/58179000131.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/cosmic_rays_affect_cloud_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/bowling_alley_business_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/filmywap_2006_bollywood_movies_hd_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/gagil.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_off0000cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC8 5412 bytes
SHA-256: 6555101079d09da1c200812805b743485f16dc4b95c8201bf19985a42fb777db
font_01_sfnt_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 10456 bytes
SHA-256: 5042dcd6ce17d2236e8342f9dec53f13124a5f28e14973f75a98154767500901

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