Malicious PDF — malware analysis report

Static analysis result for SHA-256 de899831d016edc4…

MALICIOUS

PDF

81.4 KB Created: 2021-03-10 12:07:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ac870a6b7d558f1c4ec7b5ac573d1040 SHA-1: b0a0ef155127733f08d3625d888946c55fb01869 SHA-256: de899831d016edc467a26dd15c9558ecf2a4d5e9efea48e503b4e703dda287bf
134 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=bazigar+novel+part+9+pdf PDF link annotation
    • https://cdn.sqhk.co/gudupixure/hhfgihf/alphabet_sheets_for_toddlers.pdfIn PDF document text
    • http://se-mrush.com/baby_alive_noodle_instruction_manualb1r92.pdfIn PDF document text
    • https://cdn.sqhk.co/vudebalox/ijcidjg/cnc_router_projects_that_sell.pdfIn PDF document text
    • http://xxlmature.site/how_to_make_your_own_car_battery_chargerrsxcc.pdfIn PDF document text
    • http://flylovel.com/minecraft_skylander_modaecrt.pdfIn PDF document text
    • http://flathead.us/how_to_make_a_protein_shake_without_a_blender_bottlea3mde.pdfIn PDF document text
    • https://cdn.sqhk.co/miwurazaz/gdghQjc/download_game_mountain_shooting_sniper_mod.pdfIn PDF document text
    • http://mikrotikwizard.com/my_melancholy_blues_pianor49fo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/latest_catholic_songs_mix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c698bdf3-7966-4d46-937b-2d0da34ce271/what_are_the_five_conflict_resolution_strategies_discussed_in_the_lesson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3685374-6f3f-4c74-8967-61db2aed3464/nekipumebaduxanosevuxuje.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_2b384cc28c8b44bd96d535a28d15d2bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/8782445352.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_e9d416d2406e48de993ecf710764cff4.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_38a3554245a2478f9d947b65164504bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08232e51-2688-4c8d-807f-298188523237/libanimiliwadubivisug.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_85de878aff134cfbafb4f05ce8a435fb.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_e2225559782a46b39c653f67ef41e5ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d73f1aa9-1b18-402f-800b-951473eb8852/the_expanse_wikipedia_episodes.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/89427628606.pdfIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_d64322d2a3fe4156a3e28293bf458cd3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88253eb2-08b1-404a-9509-ec3ffacef6c6/you_carry_me_movie_watch_online_free.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_0dfc8c2bd2454a68bc70b1462bee2b14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/reniliguwukajanel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 5348 bytes
SHA-256: b76c4dfa217b51d966284bee0d7331654c6d34977a5c032c0dd32887bbd7021c
font_01_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 10420 bytes
SHA-256: 6b76b66a31951d9619ff188e448bd6f7b108a8d34b35a281a084a2f02f34eb6c
font_02_sfnt_off00012449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12449 5388 bytes
SHA-256: 2063420ea4bda158db7f725c9615d21de9fc9a3c718b0e5c590a070ab00fa9cf