Malicious PDF — malware analysis report

Static analysis result for SHA-256 8985b826edde258a…

MALICIOUS

PDF

72.8 KB Created: 2021-02-09 10:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0ef230a523c6bcaa8a5d523dcd77d380 SHA-1: c8bf36a199533b081eba5231471c92fad04abb37 SHA-256: 8985b826edde258a96e3971e199bb27b7eb650e86ed3b2270e2f9c7c481f4ab0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with several pointing to disposable hosting and employing UTM parameters, suggesting a link farm or redirection scheme. The presence of a 'download button' heuristic further supports a lure-based attack pattern. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jacksth.ru/123?utm_term=quadratic+formula+calculator+program PDF link annotation
    • https://zigapugulila.weebly.com/uploads/1/3/0/7/130776078/peludifoxalog-narimivox-dodimamazajale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369917/normal_6004c14a5aa0a.pdfIn PDF document text
    • http://vas-rem.ru/retired_nascar_driver_killed_in_plane_crash6ikig.pdfIn PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/06f252ed97f21d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_5fd798c9ca58c.pdfIn PDF document text
    • http://tiktokfrance.fun/color_bump_3d_2ds_xlnusik.pdfIn PDF document text
    • http://bonifacy.site/ejercicios_resueltos_mruatgz7z.pdfIn PDF document text
    • http://sreda.city/bescherelle_grammaire_download_freebsddr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5fcdb2210b760.pdfIn PDF document text
    • http://visiblawty.com/584018246039et37.pdfIn PDF document text
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/9777244.pdfIn PDF document text
    • http://topcreditmonitoring.info/search_strategy_template0iaqq.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/bugutaj/plastic_drawer_guides_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/canon_eos_digital_photo_professional_software.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/dauphin_island_surf_fishing_report_2019.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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 5356 bytes
SHA-256: 346b22b87682bdf6babd0192dc8443e3ebab6547e14fae6800bf9db76cb6f180
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 11412 bytes
SHA-256: 035f795776ae64fbfe451a5aea8a8bf6c04ff8d0ae91bfa65975d0c2c7bedc81

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