Malicious PDF — malware analysis report

Static analysis result for SHA-256 8537048b9633fe5d…

MALICIOUS

PDF

72.4 KB Created: 2021-03-01 21:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 7b2be8753622216926e6d61e4de74eeb SHA-1: c66d99801c66c70372083605150e9b065b1bdfae SHA-256: 8537048b9633fe5db642dcca1d3fc05ce1b5070454871e5257dae425cc8a61ba
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/wix?keyword=termination+letter+for+poor+performance PDF link annotation
    • https://wisetigu.weebly.com/uploads/1/3/4/3/134357320/500bad3e027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495975/normal_5ff783687e4f0.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/ritewij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_5fd6377b4e81d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_6031d69cdcaa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479213/normal_6006643117869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481067/normal_5fd329604aa45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490376/normal_60164f3696d83.pdfIn PDF document text
    • https://lisufijefe.weebly.com/uploads/1/3/2/7/132740260/10278c5.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/zifilobesumafi/loan_agreement_template_between_friends_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/ultrasound_scan_report_boy.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/98587558156.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_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 4932 bytes
SHA-256: 8c5c99339d54fbc279fa9c6b171529d41c7eff86bd74c7091588c7f8d0637c47
font_01_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 9764 bytes
SHA-256: 559d68fcb63ca189c3e896b30d6b1489b6caa2b9c0d5bda4cefd8afdb6f16ef2