Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b143c615d11abde…

MALICIOUS

PDF

72.5 KB Created: 2021-02-15 09:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9a60feb0cc9bfebea9c0a4c69a0b06f9 SHA-1: 7f91d927b1000575786c65ad099893f4167f8e76 SHA-256: 5b143c615d11abde694cbe30a8d90b4da6ef062f5eb9a08b4fbe60b289985e94
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure (https://yafferge.ru/strik). The document body, though heavily obfuscated, appears to contain keywords related to navigation and streaming, suggesting a lure for phishing or malware delivery. The presence of multiple disposable domains and link farms further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=offline+map+navigation+live+gps+locate+explore In PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/Lghjiii/nhl_channel_live_stream_free.pdfIn PDF document text
    • http://kutakelipaxeb.22web.org/bees_saal_baad_song_mp4.pdfIn PDF document text
    • http://ewwe.space/fast_food_near_me_seafoodw5d8j.pdfIn PDF document text
    • http://instapodarok365.site/anatomy_of_movement_free_downloare8jo.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/beAihhg/3d_car_maker_software_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/85HnTie/jufotub.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/jeTFCyq/36447024890.pdfIn PDF document text
    • https://cdn.sqhk.co/zukuxenopo/dzCj5XJ/brass_nuts_and_bolts_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/giMhcii/54983469167.pdfIn PDF document text
    • http://ca-management.website/construction_proposal_template_downloadlrczh.pdfIn PDF document text
    • https://cdn.sqhk.co/jiledexuda/3JKxihk/la_reina_del_sur_season_1_episode_1.pdfIn PDF document text
    • http://wirodapupoz.iblogger.org/mathematical_physics_by_bs_rajput.pdfIn PDF document text
    • https://cdn.sqhk.co/sawitofi/hgjgfFQ/57163445096.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/ida2pSG/word_market_level_263.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/Bij7Psx/frases_tumblr_cortas_y_bonitas.pdfIn PDF document text
    • http://shoop-fl.ru/stadler_form_oskar_manual3wo1h.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/Jggeieb/39019340615.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujokobuva.rf.gd/auxiliaire_de_vie_scolaire_formation_salaire.pdfIn PDF document text
    • http://numivonef.rf.gd/wow_pandaria_alchemy_leveling_guide.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_off0000dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 5488 bytes
SHA-256: 7e47216f2174ec1965611217f847385590802f2b9c7cda9c05c8a71f2129dc27
font_01_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 10628 bytes
SHA-256: 32da7466dc5eb1327557b01fad4c984256330186afa6676e6e115c4ed87783b2

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