Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3d5ed72bee7c16…

MALICIOUS

PDF

75.5 KB Created: 2021-02-17 10:39:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7365aa525ad6a7c707e48b5d1511b093 SHA-1: 5dcb71afbfa772fce207b356d02a89083fd5adfa SHA-256: 8d3d5ed72bee7c16c6a0d9ce440fa0c288837bab0bfbc61f097ab8089f7e0bc7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are structured as SEO-optimized links pointing to other PDFs. One of the primary links, 'https://leonvi.ru/wix?keyword=st+emily+school+ottawa', suggests a lure to a website disguised as a search result. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=st+emily+school+ottawa
    • https://cdn.sqhk.co/fusajovogi/k4Mthap/28357764201.pdf
    • https://cdn.sqhk.co/xaranoraf/fBniaif/hmp_maze_prison_escape.pdf
    • https://cdn.sqhk.co/badiwugaleko/swsghwE/geometry_dash_scratch_world.pdf
    • https://cdn.sqhk.co/fujalapevame/jjgBsBu/water_slide_rentals_near_mesquite_tx.pdf
    • http://nipugupaf.22web.org/father_s_day_invitation_templates_printable.pdf
    • https://dotudamel.weebly.com/uploads/1/3/5/3/135326114/viwudemabi.pdf
    • https://cdn.sqhk.co/litigoruf/igXdJji/trending_videos_today_sa.pdf
    • https://cdn-cms.f-static.net/uploads/4452852/normal_6021265bd847b.pdf
    • http://nowatora.22web.org/shoot_em_up_full_movie_hd.pdf
    • https://cdn.sqhk.co/bowazeduz/geifuaZ/81733820142.pdf
    • https://cdn.sqhk.co/bexamajuw/ejjhehd/dojonubabati.pdf
    • https://cdn.sqhk.co/baruduwege/gejjDji/live_channels_on_hulu_tv.pdf
    • https://pabafuneb.weebly.com/uploads/1/3/1/6/131607185/3229770.pdf
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/lobivitezi.pdf
    • http://mexuloxuxinona.iblogger.org/risoxovedaja.pdf
    • http://bapefajavijofo.66ghz.com/75137492171.pdf
    • https://cdn.sqhk.co/tezizejaropu/coiaggb/roblox_download_free_unblocked.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://davojuke.epizy.com/98314142941.pdf
    • http://xiwaresijo.epizy.com/goldsheet_live_odds.pdf
    • http://wetowotupime.rf.gd/top_listened_songs_on_spotify_2020.pdf
    • http://mudopijafaj.epizy.com/imo_video_calling_app.pdf
    • http://tewidunutazi.rf.gd/prokaryotes_vs_eukaryotes_venn_diagram_worksheet.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_off0000eac9.bin
0f4abbe09c0364a65657eb7d9b16588995f1e88911bbbafd9a38fc97a885cce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 5240 bytes
font_01_sfnt_off0000fc8b.bin
82ce03efea76b8dab3e8aaa057882e071c22030ab8d21239f6aa41bf27abccd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 10700 bytes

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