Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1303cd0b3bfd1e…

MALICIOUS

PDF

80.5 KB Created: 2021-03-03 23:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b0dadcf83ad82a80536d7cedbcf424a9 SHA-1: ecbd55d62fdfea18702019ee8755ab2c549fc540 SHA-256: 5f1303cd0b3bfd1e5a30076be99474b35bfe3e512998c7a2a7a8eeba170eaa66
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely leading to a second-stage download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/aws?utm_term=too+big+to+fail+chapter+summary PDF link annotation
    • http://mp4.design/construction_business_plan_sample_pdijx1x.pdfIn PDF document text
    • http://voztrans.ru/23021077558kmyq1.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/ahjghfr/real_flip_sequin_live_screensaver.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/jignYgi/space_armor_2_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/aXjgFcy/nizoniwaxumiwojopa.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/Pgf6Ejg/among_us_avatar_maker_picrew.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/gghjQii/noel_arenado_contract.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/ronugemopagozitim.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/igMBcha/chinese_mask_change_face_changing_trick.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/hge1lDC/wpial_football_2020_covid_19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/button_onclick_not_working_android.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/honeywell_focuspro_6000_factory_reset.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/mideneku.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/gixibodekevurupe.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/33080548512.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/athens_city_guide_map.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/sojuxerobobixetapu.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/antibiotic_resistance_lab_answer_key.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/kad_emule_lista_aggiornata.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 6548 bytes
SHA-256: b27c7a011d1e25a8740c16753f32df49003034e6b6973e84691b1598814ca5e7
font_01_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 5620 bytes
SHA-256: 0483b69117f7a9275524873490571232307f27b4dd171ba24700273fb64d0529
font_02_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 10820 bytes
SHA-256: 3ff41398aeeab7525a43120be2e3077721074e1c07c4ce1fac1cc41596c72eb7

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