Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e401512fdb1e4c…

MALICIOUS

PDF

79.3 KB Created: 2021-05-15 00:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bce5d8fe4c5cc67bc7b08141df0a757d SHA-1: 7d7555067f6f4b0809177aa2841e2201ece705f8 SHA-256: c3e401512fdb1e4c46628701fc89836a6ab944569ca9576303e09b47d20ca3ad
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure and URL analysis point to a social engineering attack.

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://druttle.ru/strik?utm_term=dialectical+behavior+therapy+skills+workbook+for+bipolar+disorder PDF link annotation
    • https://cdn.sqhk.co/moxibusas/OZ0ghaH/tomb_run_game_y8.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/fZ5Hghp/infinite_loop_definition_in_java.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/BiiigcI/yellowstone_national_park_facts_wikipedia.pdfIn PDF document text
    • http://porn77.design/82534823254j6r12.pdfIn PDF document text
    • http://momentikshop.space/earned_it_from_the_fifty_shades_of_grey_soundtrack_the_weeknd_mp3_download6zx9w.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/jiPhhvU/87559109567.pdfIn PDF document text
    • http://evakuator-uga.ru/35120813698av0ow.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/punurum/fujevoxavizowija.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_334d9f7b82374398b11b1210e9ee97c7.pdf?index=trueIn PDF document text
    • https://0816b8db-db6e-4af9-a106-1766ff0f8d73.filesusr.com/ugd/06e6c8_3bf4d665bd7147fc9e9388f2b6654e07.pdf?index=trueIn PDF document text
    • http://jigijudimuxa.rf.gd/sofib.pdfIn PDF document text
    • http://zexolaxew.epizy.com/android_vs_iphone_meme.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_302dde766cf24ff6b2189e0e9439120b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/tigotutivuxirevos.pdfIn PDF document text
    • http://sivadanoxibive.epizy.com/tr3_concrete_design_mix_technical_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/robironujo.pdfIn PDF document text
    • http://guvodakar.epizy.com/84156471846.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_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 5700 bytes
SHA-256: 3d64900b5f03c4af289efcd584ab8c0de2f3a3769ec030a90443b829e91daab7
font_01_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 10712 bytes
SHA-256: 9859e880a4da5dc516a0c96dda842a96242cc6cb57c03f44e6bdfce6f6d6b926

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