Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f798f5b62f150c8…

MALICIOUS

PDF

38.8 KB Created: 2020-11-04 23:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: a2afdd0b5084fc95ace3761309e58c74 SHA-1: f3536dc15284b78bb8b5ee745514d7d9242884d5 SHA-256: 3f798f5b62f150c8c0bcae9d0a978d9fe2ad941fdc442db29eddf14ca9af9643
124 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/wb?keyword=weather%20in%20zambales%20philippines%20today In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402014/normal_5f989c3054b08.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/vefem.pdfIn PDF document text
    • https://kerumesuni.weebly.com/uploads/1/3/4/1/134131613/xuvalavanilo_xujikav_pogof_nesigut.pdfIn PDF document text
    • https://vaputonusodi.weebly.com/uploads/1/3/4/4/134493057/domosinal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f86f9aa59a80.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/1774698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_5fa2673d7281a.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/vifeneduvaka.pdfIn PDF document text
    • https://zuvagenujak.weebly.com/uploads/1/3/4/4/134454716/sarudekiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5f90b99f6dd25.pdfIn PDF document text
    • https://nabaduvikarupad.weebly.com/uploads/1/3/4/0/134096068/sokurewag-sadavix-gejomufik.pdfIn PDF document text
    • https://falibapop.weebly.com/uploads/1/3/3/9/133997194/2311541.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zetare/65460020463.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/25942228452.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/kirapidebubovukuzidixowa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D56 5292 bytes
SHA-256: 81b1420f0d280020cc566b0358c2d72a82e7f954ba95491e21477e07319398fc
font_01_sfnt_off00005f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2E 9664 bytes
SHA-256: df09e7ad24359fe570831ba1094b91298cc1640f2d2c7e9e262a93c55899f182
font_02_sfnt_off00008045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8045 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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