Malicious PDF — malware analysis report

Static analysis result for SHA-256 651a352fef6df211…

MALICIOUS

PDF

86.5 KB Created: 2021-03-14 15:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab03fab7283ccd9094613f04d8eea807 SHA-1: 77e9af5b29c23856fdb6d29395199b23f3bcb463 SHA-256: 651a352fef6df211db51c5ce5b4a8e5fa12be3e01ca912e4b32429a585466edf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting and associated with a 'utm_term_redirector'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=prentice+hall+gold+algebra+1+answer+key+form+g+1-2
    • https://cdn.sqhk.co/rubekafux/jqHLiaW/pubg_wallpaper_hd_download_full_screen_2020.pdf
    • https://cdn.sqhk.co/lisakopew/hjaEMia/99316350635.pdf
    • http://mokenolovulonom.medianewsonline.com/additive_manufacturing_of_metals_milewski.pdf
    • http://wezoweno.22web.org/black_skull_wallpaper_hd_for_android.pdf
    • http://tiluvopira.medianewsonline.com/filemogaxiba.pdf
    • https://cdn-cms.f-static.net/uploads/4420438/normal_5fd9b9f36a731.pdf
    • http://kigumelez.medianewsonline.com/jonizetu.pdf
    • http://xijulefabogi.getenjoyment.net/how_to_read_fundamental_analysis_in_stocks.pdf
    • https://cdn.sqhk.co/pewowutefiw/umgjRy8/slap_kings_free_play.pdf
    • https://cdn-cms.f-static.net/uploads/4369766/normal_6039b00336693.pdf
    • https://static.s123-cdn-static.com/uploads/4443619/normal_5fe508292d1f1.pdf
    • http://kusukeluwabe.mywebcommunity.org/64143097510.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jusagi/99954322932.pdf
    • https://s3.amazonaws.com/vososasoxumete/ars_poetica_macleish.pdf
    • http://luzatazekasuv.rf.gd/fuji_finepix_s1000_manual.pdf
    • http://nozutezejawawup.rf.gd/jagikob.pdf
    • http://kewevagisugimuw.onlinewebshop.net/singer_touch_and_sew_bobbin_winder.pdf
    • https://s3.amazonaws.com/nefunupu/new_bhojpuri_movie_hd_video_song.pdf
    • https://s3.amazonaws.com/sizabo/hack_of_temple_run_2.pdf
    • http://wutejaxevewef.myartsonline.com/jotipetepug.pdf
    • http://ravigokabuf.rf.gd/rasuxajarajabukoruf.pdf
    • 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_off00010e56.bin
60c2ea015265b32e626885476e78dd8f5b76dfbc5b5a8b677fdb3f974fae06c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 6048 bytes
font_01_sfnt_off000122e4.bin
1c6e4ad6a89c3a854a9ddb782468a894460b532b7cfb8fab914efd5f0fa366d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 12948 bytes

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