Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41758803ff8b9fd…

MALICIOUS

PDF

67.6 KB Created: 2021-02-11 02:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: e62533a64869185209d5c6f8807afbba SHA-1: 178d0d777ffaba5ca30f04b0fbd5f49e9e9b2d32 SHA-256: f41758803ff8b9fdd0af34e686f029391a81976d9c37a7e0fdb8d5dd75186c51
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=mas+practica+1+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388046/normal_5fcf30a723a5f.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/d94c399e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472200/normal_5fd8ff3222802.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445107/normal_60088a5d39cdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386084/normal_5fe5a9acaf96e.pdfIn PDF document text
    • https://perikoweb.weebly.com/uploads/1/3/5/2/135297066/6120334.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/vobikafefenopi.pdfIn PDF document text
    • https://jenamojid.weebly.com/uploads/1/3/1/0/131070605/3381376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485587/normal_6021a320144db.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/77632e55f97d8.pdfIn PDF document text
    • https://padilokemim.weebly.com/uploads/1/3/1/3/131381900/7260923.pdfIn PDF document text
    • https://foxejakepi.weebly.com/uploads/1/3/0/8/130874264/dejawifuxosima-xesiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5fd8984199aaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500444/normal_600a6c3414cab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484814/normal_5feb08d1278e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000caa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 5208 bytes
SHA-256: 38b7840d5207fd870f240c108b1e6b0768804fa02fbb07b2a371ffedae72cad9
font_01_sfnt_off0000dc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC96 11104 bytes
SHA-256: 9e989913fdb5de2052fd9061ca9741307c00dcdc3d4ceca014729a4857df73ce