Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70821d7e56e6b33…

MALICIOUS

PDF

78.0 KB Created: 2021-04-02 19:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d4e7e1edd3f7b705305f2b0e0b4866c SHA-1: 73d5b4a4689b3db5803ffaf37abd5e07184c27b8 SHA-256: d70821d7e56e6b3333853fd8208ffd6769cf2815a2e28f063825e87d25e0b73c
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 0.9997

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://xajibur.ru/strik?utm_term=spectrum+sagemcom+fast+5260+specs PDF link annotation
    • http://effektzhizni.ru/999762744961zk98.pdfIn PDF document text
    • https://cdn.sqhk.co/metevetufi/jeghT9J/telemundo_51_noticias_de_hoy_en_vivo.pdfIn PDF document text
    • http://reliables.ru/11255930043t1vp1.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/QyLT5ii/pavididazuxim.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/Mjitugi/download_euro_train_simulator_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/lasukojizix/Mhgdgif/voxonefelux.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/ij79If2/final_fantasy_tactics_wotl_dark_knight.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/cjihhjg/lg_smart_tv_user_guide_download.pdfIn PDF document text
    • http://tameeniraq.com/2012_jeep_grand_cherokee_brake_light_bulbho8n5.pdfIn PDF document text
    • https://cdn.sqhk.co/rixakowu/jigcSCS/guns_4_hire_band.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/0UNifia/game_of_thrones_cast_season_8_imdb.pdfIn PDF document text
    • http://se-mrush.com/basara_4_pc_bagas31uhg6s.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/IEhdhgk/12789698011.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/geihZji/zaxufomezodujesefefekuzi.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/haicidX/2406172808.pdfIn PDF document text
    • http://gavowobow.iblogger.org/biwuganovilewofopepuro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rugogeke.rf.gd/ardhanariswara_stotram_telugu_download.pdfIn PDF document text
    • http://gadunekubajip.rf.gd/lubizenisokunukufipi.pdfIn PDF document text
    • http://pemaravodowo.rf.gd/clinical_pharmacology_made_ridiculously_simple.pdfIn PDF document text
    • http://wujizupasexuj.rf.gd/bevubefita.pdfIn PDF document text
    • http://selomuxoper.epizy.com/ma_rmv_motorcycle_permit_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 5960 bytes
SHA-256: 27e38b0038d94a170579f33caad43841965c3b2c041bcdd6a99c6a22d6e56c34
font_01_sfnt_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 11620 bytes
SHA-256: 3165acc1aa3be0934654b981fb6903cc2d976836fc99ce6e3e48ca3cd81f5302

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