Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dc9190be4e2460…

MALICIOUS

PDF

133.7 KB Created: 2021-04-05 22:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: db5df9d11466cf988de87c2ddc197598 SHA-1: 6dfc0728f5140e89f390aca3111c3ee865ed5fba SHA-256: 99dc9190be4e2460a9c034dc1d79aa3a9fb0429d21b4c0c75c61df04099c602f
186 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may attempt to solicit sensitive information, such as recovery phrases or private keys, under the guise of legitimate content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://mezovuduw.ru/award?keyword=microsoft+access+vba+programming+tutorial+pdf PDF link annotation
    • http://sitebomobegux.sportsontheweb.net/how_to_draw_books_for_9_year_olds.pdfIn PDF document text
    • http://freefire-gifts.com/basel_norms_noteso45ti.pdfIn PDF document text
    • http://labincom-med.ru/how_to_increase_speed_on_2014_club_car_precedent20pqi.pdfIn PDF document text
    • https://timonuwek.weebly.com/uploads/1/3/4/3/134383578/gasesevinupoduzajami.pdfIn PDF document text
    • http://govnosiakxws.online/monitoreo_fetal_acog_slideshare9vqdl.pdfIn PDF document text
    • http://you-bestshop.xyz/the_miseducation_of_the_negrozibg8.pdfIn PDF document text
    • http://ladujose.sportsontheweb.net/59049802566.pdfIn PDF document text
    • https://fijapirugonobi.weebly.com/uploads/1/3/4/3/134315317/8195756.pdfIn PDF document text
    • http://voicebftyi.com/wedunibanebodawomanigorir78sq4.pdfIn PDF document text
    • http://helpcontactform.com/video_star_apk_free6zj88.pdfIn PDF document text
    • http://miwewumexurigan.sportsontheweb.net/66702226168.pdfIn PDF document text
    • http://my-favshopg.online/5e_tunnel_fighterlfcvd.pdfIn PDF document text
    • https://luselovuxetox.weebly.com/uploads/1/3/0/7/130739290/fusojoguxuzuja_bujodetupavo.pdfIn PDF document text
    • http://liketime.online/snake_touch_n_gorofn4.pdfIn PDF document text
    • http://moshon.space/3106558606476bbv.pdfIn PDF document text
    • http://ionatr.fun/chirutha_cinema_songs_comxgm93.pdfIn PDF document text
    • http://legexebe.medianewsonline.com/49904331780.pdfIn PDF document text
    • http://bluebadgeform.com/what_is_the_best_meal_replacement_to_lose_weight489a7.pdfIn PDF document text
    • https://gomimujetaveve.weebly.com/uploads/1/3/1/4/131406784/1917918.pdfIn PDF document text
    • http://spain50off.info/nabefupmp2l4.pdfIn PDF document text
    • http://goldotzyv.ru/843141913401itu8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_e739b58f3967486c9a6d0c7a535b4205.pdf?index=trueIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_6929c5f45b67420fbb1b47749e2fdfe2.pdf?index=trueIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_99cfeb1d3d7b403088a0d80fc77c3073.pdf?index=trueIn PDF document text
    • http://medazupu.onlinewebshop.net/the_voyage_of_the_beagle_charles_darwin.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
    • 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_off0001b515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B515 5680 bytes
SHA-256: 28f38e78f5f14a39f55a911c855d8d93885a6f19802960294da3a91c0d1fac8d
font_01_sfnt_off0001c863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C863 12736 bytes
SHA-256: ee71453cde81bdc9ca4bd9465f2cdd9cab3d7bf316a8e73373748f46e779f209
font_02_sfnt_off0001f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2D6 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449