Malicious PDF — malware analysis report

Static analysis result for SHA-256 659f79a8ac998f1e…

MALICIOUS

PDF

77.7 KB Created: 2021-03-21 04:22:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d08bf6988923fb89c3db01bb1e1ec882 SHA-1: 8ec5e058fe9457de609dfb46636fe06a8a49a2c8 SHA-256: 659f79a8ac998f1e0890f6024ba035c06e3732cef148c31ed4184da7e140df0d
166 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous external links, many of which point to disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to provide a password for an archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jumiwimov.ru/award?keyword=curso+frances+pdf+completo
    • http://ruwufuwetoj.mygamesonline.org/razajejowowitatosedap.pdf
    • http://nageramuvepom.mywebcommunity.org/74774889032.pdf
    • http://smartroom.pro/7266373613m2v25.pdf
    • http://jajuviramigawo.medianewsonline.com/basic_electrical_network_theory.pdf
    • http://thelandofbadideas.com/13503287394m23nt.pdf
    • http://fikosarodone.medianewsonline.com/appsc_polytechnic_lecturers_notification_2020.pdf
    • http://bejawutipage.mywebcommunity.org/agamben_livros.pdf
    • http://ptmonline.ru/aggiornamento_android_8_honor_7xsev5k.pdf
    • http://kofodotig.sportsontheweb.net/canon_in_d_violin_free_download.pdf
    • http://sarhello.online/920881788767sijx.pdf
    • http://mesikigodijope.mypressonline.com/rororafidasefumamibofi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://safedoguno.onlinewebshop.net/afc_asian_cup_schedule.pdf
    • https://s3.amazonaws.com/tosevud/band_lab_apk_free.pdf
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_e5ebc7baa20a4159a0b0684e89cc0d5d.pdf?index=true
    • http://bibezakomi.myartsonline.com/safety_plan_for_construction_project.pdf
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_7a73c4b237cd4e1abc21c6ea2e87f5a9.pdf?index=true
    • https://4db61c00-1078-4917-8a1c-a2c1480eb6e0.filesusr.com/ugd/c94206_9033c349768e4e29a923055161cbd293.pdf?index=true
    • http://taguloxutenafol.myartsonline.com/93743477678.pdf
    • http://nixomirorubu.myartsonline.com/how_to_program_bmw_f30_garage_door_opener.pdf
    • http://kutoxinupuroxo.onlinewebshop.net/visual_display_of_quantitative_information_epub.pdf
    • http://mugazukadum.onlinewebshop.net/kifit.pdf
    • https://s3.amazonaws.com/ganubatebedoxez/60395140652.pdf
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_1530a504d729400a9b49f5662a77f382.pdf?index=true
    • http://gifidabula.atwebpages.com/nujofifakoso.pdf
    • https://57ead060-d7b3-4f59-a803-6c9b47c0028a.filesusr.com/ugd/f30481_3ba9ae32bee5412aba627677e864d126.pdf?index=true
    • https://s3.amazonaws.com/tobobowu/hotspot_shield_free_for_pc.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_off0000ef26.bin
8adf461b7af3b0523a9397e8027c4f8d1b9273b19d1ff54db815bac12bed0fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 5208 bytes
font_01_sfnt_off000100c2.bin
4383e0accd0e43ff283f904ae63cc22d1171507dc834f549f6f7bc9462975336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 11864 bytes

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