Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fcaa73adb55bed…

MALICIOUS

PDF

68.0 KB Created: 2021-04-01 12:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca73d0a60a9dbf4498e1f8854392a097 SHA-1: 7ebe74d4ec6f1a4c6549dd91fb405313b61446d5 SHA-256: c8fcaa73adb55beda5f69da1e8ba6ff56372f2a471e113ed6b28216e4cfc45b7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to redirect users to potentially harmful websites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=benchmade+943+g10
    • https://cdn.sqhk.co/sadebupunen/ivlq4cG/shogun_restaurant_spokane_valley_wa_99206.pdf
    • https://cdn.sqhk.co/dabozijide/FqwiLjd/dezosugulapuxi.pdf
    • https://cdn.sqhk.co/terasovo/8cP1uij/73312843409.pdf
    • https://cdn.sqhk.co/juzosugun/ghdttdA/novigufogisafalopoxevotin.pdf
    • https://cdn.sqhk.co/seseniluvus/ChiUshc/82585835400.pdf
    • http://zegobudipaju.mywebcommunity.org/vemolakozubaxamapik.pdf
    • https://cdn.sqhk.co/lojosexotak/Nheghih/laxomiwarejemewi.pdf
    • https://cdn.sqhk.co/popaxutu/GhDiaij/cute_captions_for_pics_at_the_beach.pdf
    • http://demuxum.getenjoyment.net/cerebral_palsy_2020.pdf
    • http://bowuvudofi.scienceontheweb.net/will_you_please_be_quiet_please_short_story.pdf
    • https://cdn.sqhk.co/mujexoxa/jgJkigw/world_war_heroes_ww2_fps_gameplay.pdf
    • http://iwhite.space/cuales_son_los_lisosomas_primarios_y_secundariosm7jnq.pdf
    • http://raffle.website/what_are_the_organs_of_dynamic_equilibriumqasf5.pdf
    • http://momarivido.mypressonline.com/45519034996.pdf
    • https://cdn.sqhk.co/tobijoge/xjijfgl/protect_the_vip_team.pdf
    • https://cdn.sqhk.co/sevigexew/Giea3Si/train_to_gensan_mod_apk_unlimited_ducks.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://duvodix.myartsonline.com/waste_to_energy_notes.pdf
    • http://kedisijusa.onlinewebshop.net/kojot.pdf
    • http://wenibeliso.atwebpages.com/answer_sheet_sat.pdf
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_02309b45de4a480b8d5b72d5faf19962.pdf?index=true
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_3e3f71185f6b43c6aeaba91f3221a26f.pdf?index=true
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_6fad18cefb25472590aa13343714c13e.pdf?index=true
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_2354deb588634431881e6ba4e263dca0.pdf?index=true
    • 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_off0000cc0d.bin
56fde98c8e9daf510987163e60850a8591feb3e53af8951a1083f264814a7620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0D 5696 bytes
font_01_sfnt_off0000df5d.bin
7a063d0253e145111736362bd7a9278e8f36e1d7486bd7e542ca9895719239a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 10332 bytes

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