Malicious PDF — malware analysis report

Static analysis result for SHA-256 f016c024f3b5a16d…

MALICIOUS

PDF

73.9 KB Created: 2021-01-29 03:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4e5241689d0b4282d8c4b63d6c65c077 SHA-1: 0da3bd5a92df089ca0e66a1d8daaaefd671c6bbc SHA-256: f016c024f3b5a16d50133e4de4c7879c35759f25ca9c20efcfe6e3d7231e4880
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/123?utm_term=unfired+clay+bricks+for+sale PDF link annotation
    • https://cdn.sqhk.co/mobubivifa/eiiRghy/bbc_politics_today_podcast.pdfIn PDF document text
    • http://smeh-mif.space/rope_around_neck_meaning0vo3m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_600ff409e0942.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/ibw9Bgc/88894028419.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377408/normal_60069f9bd21fa.pdfIn PDF document text
    • https://cdn.sqhk.co/nalujujoso/Hihohds/pokemon_go_can_t_see_friends_tab.pdfIn PDF document text
    • http://semengergel.ru/99324104273lzze3.pdfIn PDF document text
    • http://befigter.xyz/satizotisisefumo05v46.pdfIn PDF document text
    • http://italy50wow.pro/englisch_abitur_hessen_zusammenfassungfc66u.pdfIn PDF document text
    • http://extrameets.fun/beagle_breeders_ma6g7o5.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/ggMgcia/24181539186.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/jbhjaoj/beach_of_the_war_gods_full_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_5fd92be608a29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376850/normal_5ff5b5ddcbc2c.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/2775529.pdfIn PDF document text
    • http://wekeb.space/tusod2li04.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/tumevebunulekefevizona6n1lx.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/pisedij/before_sunset_full_movie_dual_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/acute_pharyngitis_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/android_10_release_date_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/rutereligixijonibarala.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_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 5312 bytes
SHA-256: db7f1b1857ec1efda4f685340af9630cdddeaf5c46ea52b605b9febba4cf7cd7
font_01_sfnt_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 11132 bytes
SHA-256: bb8bcb5ec3550910ba9ebd2bdb831d16acf73d29d9b2da256cdc58527749eb72

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