Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5a06b30ae43186…

MALICIOUS

PDF

69.9 KB Created: 2021-03-30 20:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 140ebf5a857998eb354eac78b3dd809c SHA-1: e50de0dd30bfd71fb240626f8f129b800e280b8f SHA-256: 4b5a06b30ae43186dc267c479be1d79b0c169c555a356eb4f40b0f492d95043a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URIs indicates a likely attempt to download or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=dj+tik+tok+cinta+luar+biasa
    • https://cdn.sqhk.co/revujinarewu/uuGggWx/witcher_3_craft_silver_sword.pdf
    • https://cdn.sqhk.co/dowotovewi/he1icgh/firiluni.pdf
    • https://cdn.sqhk.co/wetabupi/Oiejcih/lepojegomukezeb.pdf
    • https://cdn.sqhk.co/majumoros/7cJdheq/cook_steak_on_baking_sheet.pdf
    • https://cdn.sqhk.co/zozusexub/jajPJTt/57915139744.pdf
    • https://static.s123-cdn-static.com/uploads/4415331/normal_5fe04e72d50dc.pdf
    • https://cdn.sqhk.co/resozasevej/ghrhjF8/smile_images_wallpaper.pdf
    • https://tutemedoz.weebly.com/uploads/1/3/2/8/132814241/737029.pdf
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/sadobebiliwepem_basepidawer_fejof_fukowiwepeto.pdf
    • http://shtangye.xyz/29546174227y1dxa.pdf
    • https://cdn-cms.f-static.net/uploads/4382784/normal_605b3acad07df.pdf
    • https://cdn.sqhk.co/lowanivari/ibJ1hcQ/69315505287.pdf
    • https://cdn.sqhk.co/jobiwokojo/0mjjmza/25940940265.pdf
    • http://accueilcmb.com/iso_15614krzcb.pdf
    • http://lesantyqas.online/scotch_yoke_mechanism17idf.pdf
    • https://static.s123-cdn-static.com/uploads/4484820/normal_5ff5a3670b5e1.pdf
    • https://cdn-cms.f-static.net/uploads/4369794/normal_604607b9ca43d.pdf
    • https://lawaxiwutaf.weebly.com/uploads/1/3/4/3/134356413/4146608.pdf
    • http://kernig.online/silver_glitter_eyeshadow_nyxcw0ln.pdf
    • https://static.s123-cdn-static.com/uploads/4401697/normal_5fee9f44c1db3.pdf
    • https://cdn.sqhk.co/xinulezebi/ogeichg/browser_video_app_for_android_tv_apk.pdf
    • https://nodirerivono.weebly.com/uploads/1/3/6/0/136052085/9073835.pdf
    • http://domensita.fun/jepapolojimaz1jsai.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b2.bin
e130f9ea05a7f472606d1565eed7e9097a355508f30a62ae3791b76c8d3bb1a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 5072 bytes
font_01_sfnt_off0000e60c.bin
712279e19c22aba9b6fe42f13a6eec8e134e0630a38010f91ea18e3378973a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 11500 bytes

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