Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42f9289ee014f74…

MALICIOUS

PDF

67.5 KB Created: 2021-02-13 01:12:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: e098cd0981df0171b9fc8deb1397cf80 SHA-1: 13ddf7c986b339e36833c5df790b23ec01cd0b36 SHA-256: b42f9289ee014f74d211f005bdf36f728def87de9ad73b25703ad796920318cb
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wix?keyword=msu+denver+transcript+order PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381551/normal_5fe58b2a56bf0.pdfIn PDF document text
    • https://cdn.sqhk.co/givikufat/heKTqMq/kuvepozus.pdfIn PDF document text
    • https://xurebutira.weebly.com/uploads/1/3/2/6/132681359/3f6a8e73603450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454429/normal_6004aa5aa6c3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381529/normal_5fe5d3527d808.pdfIn PDF document text
    • https://tawixepew.weebly.com/uploads/1/3/0/7/130739069/7371583.pdfIn PDF document text
    • https://sudusiwigi.weebly.com/uploads/1/3/1/0/131069987/gobasawoduwumi-xadixet-jabiwotax-susiviriliz.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/20524622290jhbq0.pdfIn PDF document text
    • https://cdn.sqhk.co/xewasejeve/5yuCifN/86679201743.pdfIn PDF document text
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/jebirarepidas-lobofularamam-ribas-duvakoji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459470/normal_5fe1eab02b38c.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/wenobagupexekap/atmel_8051_microcontroller_datasheet.pdfIn PDF document text
    • http://texatopewewew.epizy.com/xedumedigu.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_off0000cc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC61 5100 bytes
SHA-256: 9bca08f85ee0555757af60ffca4f2d63b0c8ffa577cdfeb73a27e7276fd97d6d
font_01_sfnt_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 10464 bytes
SHA-256: ed88249464731733d796f850915dd67d7770b65ec3b5d2f28131ce19fdb17a9c

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