Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c779877a1c6df4…

MALICIOUS

PDF

88.3 KB Created: 2021-03-08 20:56:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f82c4d87129458ad7d002a38bea706d0 SHA-1: 53fc00d8a851468d62fe94312dccbb921297d025 SHA-256: 47c779877a1c6df466a9614f23dd680e5995e80da904e4931be3dc655ca11316
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/123?utm_term=mathematics+for+economists+answers PDF link annotation
    • https://cdn.sqhk.co/surikuzezun/GuhhvYy/apocalypse_cow_food_menu.pdfIn PDF document text
    • http://gimepar.22web.org/rupepu.pdfIn PDF document text
    • http://vofamewa.22web.org/64004386920.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/bz7jhje/66938014181.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/519010373.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/jche2ic/background_hd_images_4k.pdfIn PDF document text
    • https://cdn.sqhk.co/volakase/gcWFidW/joe_vlc_video_player_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_c50b3b0ac9844e98a1d1e25c5c84e684.pdf?index=trueIn PDF document text
    • http://jajunoz.rf.gd/disolventes_proticos_y_aproticos.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_51fddf4363734932a9d88bd06e8c7d20.pdf?index=trueIn PDF document text
    • http://lojomugago.epizy.com/naruvafiponekisanemilu.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/bufilusimo.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_af6aa971293f4080aecc73ca8566a56d.pdf?index=trueIn PDF document text
    • http://merapenerabari.myartsonline.com/19772262647.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/levimuxapu.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/who_dies_in_the_book_of_life_all_souls.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/mulapafutenikajulabuzupa.pdfIn PDF document text
    • http://warufadul.rf.gd/demuveworadoj.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/4540686650.pdfIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_2672de73d0c74b25972db8193b28cfe4.pdf?index=trueIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_1652d1cebb494868bd286932cb646f51.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 5188 bytes
SHA-256: 8b19890af34dc53437843bf5d307244ed5f5f021902647c46d30eef4ac623fef
font_01_sfnt_off00011505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11505 11936 bytes
SHA-256: e250699ac80ceaa99f827f9cf69e201126b05480980a56fa66c7a26e7890d860
font_02_sfnt_off00013e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0B 16164 bytes
SHA-256: c8e4f3db16c8fec26e091902e4d8b7f8a329bc9fbbf4737c71cac4739d26a80c

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