Malicious PDF — malware analysis report

Static analysis result for SHA-256 83664718c1ed62ac…

MALICIOUS

PDF

82.6 KB Created: 2021-02-24 20:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3d3d9a7eca89af8fbdbac458dc741e0d SHA-1: 4bda6482512618d24cc029cdd9f28306529a2d97 SHA-256: 83664718c1ed62ac409321bdc7d4cbb3e9cbf14498cf70e46c8e9bb2c9086a8e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://crophysi.ru/wix?keyword=aphrodite+short+story PDF link annotation
    • http://instgrmmverifiedbadge.com/pokutuxovazitumakoguw19hkg.pdfIn PDF document text
    • http://discount50.pro/basitugumk4fws.pdfIn PDF document text
    • http://jobipibi.22web.org/georgia_sales_tax_excel_template.pdfIn PDF document text
    • http://romabeveseruzor.22web.org/gartner_report_on_cloud_security.pdfIn PDF document text
    • https://lavolobaned.weebly.com/uploads/1/3/0/7/130740571/4f565a236.pdfIn PDF document text
    • http://mamontov-net.cc/17661361327wrybs.pdfIn PDF document text
    • https://tunilawogipafex.weebly.com/uploads/1/3/2/8/132814387/5813242.pdfIn PDF document text
    • http://agent-ritual495.online/rezisan5k87e.pdfIn PDF document text
    • http://vagebunav.iblogger.org/giwewaliturezagidew.pdfIn PDF document text
    • http://trokot-shopnew.online/pajomommoem.pdfIn PDF document text
    • http://clientesdkb.com/pictoword_level_527tglvi.pdfIn PDF document text
    • http://rollernefrit.xyz/nakurotenujageguporitos3odkf.pdfIn PDF document text
    • http://lightly.store/james_destroys_diseases_website1zv2g.pdfIn PDF document text
    • http://doxugivo.22web.org/sabrina_claudio_about_time_album.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://reditab.epizy.com/angry_prash_video.pdfIn PDF document text
    • http://xovipofeguz.epizy.com/armaflex_insulation_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/biddeford_blankets_microplush_electric_heated_blanket_throw_black_red_buffalo_plaid.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_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 4896 bytes
SHA-256: 3472c085315e29de49b88555de63616fbbcc07daa70a1a2cfee87a7d121b8542
font_01_sfnt_off00011a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 10240 bytes
SHA-256: 8e118be4e28fa5d9b897f2215f42d68f907d30a0e7eebdb9d3f9fd883ba9a15a

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