Malicious PDF — malware analysis report

Static analysis result for SHA-256 8445bc719dc67067…

MALICIOUS

PDF

70.3 KB Created: 2021-03-01 18:19:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: db1f26fc528bfc7726458a4826a82264 SHA-1: 188793f78bbde7b95729d6fed1df9f723bf2ce38 SHA-256: 8445bc719dc670675ecffc03c82914fdfaf2a0bf8e0b7b80287de35347d7dc95
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic findings suggest the document is designed to redirect users to malicious sites.

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://jacksth.ru/wb?keyword=conversor%20de%20medidas%20pulgadas%20a%20milimetros PDF link annotation
    • http://abwaab.su/749061245543fivy.pdfIn PDF document text
    • http://cleanup-sale.site/skype_for_business_server_2015_enterprisezwrat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392472/normal_603bd34e7d6ff.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/21591690632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458122/normal_5fdb67d6d144a.pdfIn PDF document text
    • http://livethailand.fun/dog_balloon_drawingty5zk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473926/normal_5fc8a393c8173.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/hbieWic/2610562457.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/jPiijfs/17010067776.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/Z1dxeCH/remede_grand_mere_nez_qui_coule_bebe.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/woxojuxafopuv/does_xbox_360_have_live.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/juriban.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/tupekas.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/antivirus_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/69966825530.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_off0000d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 5244 bytes
SHA-256: 2c4765941675fdd6ccaa4b2b9ab02ccd558715e20ce0d7735d9ce899486c0095
font_01_sfnt_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 11856 bytes
SHA-256: edd346eb7a79de2e40d832eee91d6b601748044a9705fb77f174d83f6f96c93c

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