Malicious PDF — malware analysis report

Static analysis result for SHA-256 133ec26ec0a7238f…

MALICIOUS

PDF

73.6 KB Created: 2021-03-22 23:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ade844b079921b95f7916b63cf5ba951 SHA-1: a9af0939dd228ad39a4f5c624be85c8cc408212d SHA-256: 133ec26ec0a7238fb3373d6a24d3d00abe48bdc0555dffe11c5fe02e7bda8f62
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to potentially malicious domains. The document body, though heavily obfuscated, suggests a lure related to 'ordinary annuity questions and answers'. The presence of many external URIs and the link farm heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=ordinary+annuity+questions+and+answers PDF link annotation
    • http://topesiz.22web.org/vertex_form_parabola_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_600a92b56c7a0.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/jagesexedupokogebgf8.pdfIn PDF document text
    • http://ziduzuraxiralet.iblogger.org/the_fifth_wave_book.pdfIn PDF document text
    • http://steelsho1.club/jubukusasaxibijeredy6prl.pdfIn PDF document text
    • http://dumokasazosates.iblogger.org/agrarian_revolution_in_england.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/jHgejcN/easy_banana_mango_milkshake_recipe.pdfIn PDF document text
    • http://bigowet.xyz/60911092493k17mj.pdfIn PDF document text
    • http://rozel.ru/22918197729kgb7j.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/heOjf6P/tekiboguwenobusodifonimax.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/hBijoG9/lavililawelarusejuraj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383128/normal_5fc7a3229787a.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/fjcIjj0/memak.pdfIn PDF document text
    • http://hesap-al-sat.com/2013_civic_service_schedulenscjt.pdfIn PDF document text
    • http://iqecoportal.ru/loximufadigufezofa7rtwk.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/nakuzafol/sims_4_update_december_2020_mods_disabled.pdfIn PDF document text
    • http://filanak.rf.gd/busted_by_the_feds_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/rumamiganodunawerakis.pdfIn PDF document text
    • http://rukitugelonodov.rf.gd/zevimepizojusosixarod.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/case_39_2009_full_movie.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_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 5132 bytes
SHA-256: 6e9cb743397c25cf96135afb427d32530fdaa31ba016d76bfd503a7d499cd4b8
font_01_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 10756 bytes
SHA-256: ce23b6553a41ea51ff074f11ee895b307da51b3d3ea2c667406c37a486598019

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