Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe555e1bf4eb4b4…

MALICIOUS

PDF

73.7 KB Created: 2021-05-01 17:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1f09eb599ac31ee4acc95a751a3a462a SHA-1: a1d234bbea0247e42633784e53ce50bbecdbc3db SHA-256: 8fe555e1bf4eb4b43411264cac7dcbc0c121d228d6f2ba9e8e70d4a195352795
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains multiple embedded URLs, with the primary one being https://gimoguvi.ru/strik, presented in a context that suggests a lure related to a book title. The presence of numerous links and disposable hosting indicates a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://gimoguvi.ru/strik?utm_term=introduction+to+brain+and+behavior+4th+edition PDF link annotation
    • http://mafuditovu.iblogger.org/extraneous_roots_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/giPuolJ/56387131749.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5fdd2fc7c6bdf.pdfIn PDF document text
    • http://jajokojunewi.mypressonline.com/hemagglutination_inhibition_test.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/ti_foxit_reader_min_ph.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_600d6a8d58002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459341/normal_606c02275e70b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480748/normal_604b58000ccd5.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/project_management_training_materialppt.pdfIn PDF document text
    • https://cdn.sqhk.co/razotefo/ghjhicD/butterfly_coloring_sheets_printable.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://wijawogenaga.epizy.com/sunowoxokakub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f59a3b-7971-4bca-a238-e6e5d3d97726/diferencias_entre_la_mitologa_griega_romana_y_egipcia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4492e8b6-6535-4ef2-aebf-18545c8252e4/jabopuzevuxajen.pdfIn PDF document text
    • http://larisakexifa.epizy.com/sosewoko.pdfIn PDF document text
    • http://vuxebezedigelun.onlinewebshop.net/siwapegol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e94fc335-bb16-4062-8124-13c598f75982/22604369490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04100da9-5544-4c94-855b-c084ad89e0f6/332907769.pdfIn PDF document text
    • http://pobetij.epizy.com/bivomelabokojoromimo.pdfIn PDF document text
    • http://vekabibazegak.rf.gd/6183410809.pdfIn PDF document text
    • http://tuminexozuvino.atwebpages.com/20516544725.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/kinememiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49432eaf-ece1-4714-b651-e4b1b047ed06/kenmore_elite_he4t_washer_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/nelozusufotevutuper.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/how_to_complete_certified_mail.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_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 4924 bytes
SHA-256: e25f588fe37c7d85cd4ef20f271b2c4e7805d0c6b7ca1d058f9fcc61ea5ad1c6
font_01_sfnt_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 9984 bytes
SHA-256: 39b2e6d5b8a9254fa6576d94b8fc37a7b6d62b13df61bac4f7d1a88536df612b
font_02_sfnt_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f