Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec94eafeecd6d904…

MALICIOUS

PDF

83.5 KB Created: 2021-03-15 11:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dc03a52a3a2b0893ae4c266f95660223 SHA-1: bb47cd9e8efd9d3c9f71b18450c9ed7586ecba49 SHA-256: ec94eafeecd6d904b375d678e4dbbbed6e8678a108540c55ce5038e75a233b6f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, with at least one pointing to a suspicious domain ('nipisod.ru') that is likely used to redirect users to malicious content. The PDF's structure also indicates it functions as a link farm on disposable hosting, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/wix?keyword=s2+cell+map PDF link annotation
    • http://astrology-personal.online/where_did_the_butterfly_knife_originated37lkn.pdfIn PDF document text
    • http://xaninivinekeni.iblogger.org/asma_bronquial_tratamiento.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_601fc6e3157e5.pdfIn PDF document text
    • http://dulexip.22web.org/timeline_templates_excel_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_600b54a4bc0d6.pdfIn PDF document text
    • http://creditscorecard.info/90695760560bpvaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_604cd7bd8de40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394062/normal_604dad0d389aa.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://uploads.strikinglycdn.com/files/b9301b48-e81e-4f72-bb64-ecf2950572d1/multiplying_and_dividing_functions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/apercu_pro_medium_font_free.pdfIn PDF document text
    • http://lidekajemunow.epizy.com/sway_michael_buble_music_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559b8bfc-1f70-453f-a5bd-e40a1661ce10/is_the_shelby_gt500_coming_to_australia.pdfIn PDF document text
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_e6daf0c45df64110b4d0cba1561cbfc5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea9db977-2197-4007-98ed-22954b53687b/site_planning_and_design_handbook_thomas_h._russ.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/pdf_file_er_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1550bf6-759c-405f-bc7d-f59c65509e35/imac_user_guide_apple.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_ce4424bbaeba4814bad2b0836df974f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/bokeh_template_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/2015_chevrolet_impala_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/computer_hardware_crossword_puzzle_answers.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_ab41f409b55149a6a797f3872ced328b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a57b694-855f-40ec-af19-ab00f3102662/zuzumorufuponemimu.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_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 4484 bytes
SHA-256: 7a319ee7c49ece7d8c888422917a5be9ce11c4bc55fbef5a71728a50c8d0db05
font_01_sfnt_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 11000 bytes
SHA-256: 20173ec6f92886777295917586fd108bc27a9266d498cc6c68807faa21f878c4
font_02_sfnt_off00013264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13264 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34