Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3f91d2c865f3d3…

MALICIOUS

PDF

42.4 KB Created: 2020-10-16 10:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 5b6194e83b75162934e1ab5d8824f10e SHA-1: 95d6d46b4b45c2bad9fec6addc2a54923bfebddf SHA-256: de3f91d2c865f3d301bb9f74bc9da2ab9ad317114402ad16ff30b9bbf155e7c4
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/7fde262bb4b.pdf.
  • 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.
  • 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://cctraff.ru/strik?keyword=ftce+professional+education+study+guide In PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/7fde262bb4b.pdfIn PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/5146662.pdfIn PDF document text
    • https://pebiname.weebly.com/uploads/1/3/1/4/131453048/6092262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f89123766a20.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/midewevimozov_bumotazigedorop_zuged.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/zasuvifuvovupok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/68559a7b-63cf-477c-ac90-65b3b720dce9/bagowuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fad41ad-dde1-490e-8d4c-89cacb291dd0/jekuge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b0bd90-eccb-4e5d-bd79-49b308c7fefe/jajadusisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dca07bc-f61d-40a1-8482-ac127152e06c/bilipokumejelepeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1ab232-144c-4d8b-aa3d-a97ad6ca6d98/rerowikagomoludile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd8c2b2e-7780-49b6-aa6d-79831463b07d/43622810342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8ac3a6-c855-40e5-910a-ae024ed34109/7471868435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98546d14-25a8-410a-9da2-c95951cfd0c8/ragesaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bcf3f5b-16da-4066-8725-9f7e3897024c/guzaligoxoxapekaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c8f71c-7132-4461-b268-7c3ac6723756/3269486204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed4fc73-cdf4-4cf9-84e2-997d41430bdd/907076281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a837ea-28d8-443f-857a-8ed505a2f733/84254160957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6605c7-d727-4fe3-9e27-e8d87f48aaf2/15183600836.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_off000065ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65EF 5380 bytes
SHA-256: 38969be64900519ab568456b9a51dc8eb82b617fda8042132ba708328b7af6ac
font_01_sfnt_off0000784d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x784D 10556 bytes
SHA-256: e7cf90d45b22b072396902305d6c527f4424b27643e629fdfa19665095e59141