Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ed4be5ff0b0d90…

MALICIOUS

PDF

67.1 KB Created: 2021-02-12 13:35:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 573aa8798305a4d9e40fab5568639d2e SHA-1: 695bdd80ab4702778e779d8b4a7e8dbb09b916db SHA-256: 50ed4be5ff0b0d9099c1c23c1440bd40aaa0df1104354a7f66f72aad0564f67e
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to PDF generation, indicating it was likely crafted to host these malicious links.

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://baarspo.ru/123?utm_term=fe+reference+handbook+9.5+vs+9.4 PDF link annotation
    • http://trickyturkey.com/pagitulezidecufzp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371814/normal_5fdeae411907c.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/YijahiD/boxijafuburapobo.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/ZiaNoig/catfish_fishing_season_california.pdfIn PDF document text
    • http://fringigejy.site/879541618621cx9m.pdfIn PDF document text
    • http://trickyturkey.com/vw_beetle_2012_manual3epsz.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/neranasorekudiw_lotufidakifagas_devusojexisa_vibizelax.pdfIn PDF document text
    • https://wovugozota.weebly.com/uploads/1/3/2/6/132695813/516611.pdfIn PDF document text
    • https://mikezibe.weebly.com/uploads/1/3/1/4/131453119/630253.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/akIq9gX/93601148881.pdfIn PDF document text
    • http://alsamcctv.com/epic_astro_story_layout4ina6.pdfIn PDF document text
    • http://dvestideyli.xyz/datasheet_arduino_uno_3arr0n.pdfIn PDF document text
    • http://topcreditscore.info/grade_4_symmetry_worksheets_freeyh7wu.pdfIn PDF document text
    • http://italiahot.space/41936233300qta1q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jifagul.rf.gd/78661288664.pdfIn PDF document text
    • http://lixurun.epizy.com/33793943639.pdfIn PDF document text
    • http://mowesod.epizy.com/fuwudukijilar.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_off0000c826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC826 5696 bytes
SHA-256: af932a3c877b83b9b009452f298b75be1d0128cd3bbff5ba27e0e4dd689f5546
font_01_sfnt_off0000db9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 10504 bytes
SHA-256: eabd69b374b945ab222a554079f5ec6617a1cd0ec28a584b2cb8aeb28220db39

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