Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8a489fc250f254…

MALICIOUS

PDF

74.4 KB Created: 2021-02-27 14:37:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 1e2be577657da135268b4207c57d54ba SHA-1: 757e4a604cc05e744813abd4519b705c12ff92e0 SHA-256: ff8a489fc250f2545636f1a4d13db6940f4d141c0a879fbc81645734437a2de4
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/wix?keyword=touching+spirit+bear+reading+guide+answers PDF link annotation
    • http://istlan.space/buwuvitesaxegezukijege2m74a.pdfIn PDF document text
    • http://jeruxawi.iblogger.org/7882016100.pdfIn PDF document text
    • http://kukushpa.fun/how_to_start_writing_a_good_bookml9bo.pdfIn PDF document text
    • http://itverys.space/what_exercises_will_help_plantar_fasciitis8ovkj.pdfIn PDF document text
    • http://mgacessoria.online/how_to_use_an_amana_washing_machinenjknc.pdfIn PDF document text
    • http://tersq.space/idsa_tb_guidelines_2017k6fgh.pdfIn PDF document text
    • http://cleanup-sale.site/descargar_musica_de_la_adictiva_banda_san_josebeip1.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/hhhgfia/21770439203.pdfIn PDF document text
    • http://tricitysikhs.com/elnathan_john_becoming_nigerian_downloade3nv8.pdfIn PDF document text
    • http://vrestoran.info/wupumidasosor0ge.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/hfKfrgf/outdoor_survival_knife_reviews.pdfIn PDF document text
    • http://pressit.space/14391217624nc000.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
    • http://virirunabeso.rf.gd/52204142413.pdfIn PDF document text
    • http://mimogovudefo.rf.gd/python_selenium_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/50505364963.pdfIn PDF document text
    • http://juvokumepi.rf.gd/euripides_bacchae_analysis.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_off0000d690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 5364 bytes
SHA-256: 4bbea0bc83c7cdd86ead7e07f6bb658c637cf336328804116d2b3320dc59a255
font_01_sfnt_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 10472 bytes
SHA-256: a8eb86bf07f9ba90f3d645a23f08bb4b2acfd6dd4ec8cab9912655957fc53d25
font_02_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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