Malicious PDF — malware analysis report

Static analysis result for SHA-256 675ac99bd390bfc3…

MALICIOUS

PDF

85.3 KB Created: 2021-02-17 17:19:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4125b1d81848b3aa97e375ab8baede1d SHA-1: 222ea5273228a01ece141a7d0c9aaeed651d5681 SHA-256: 675ac99bd390bfc3db3638ec6f99beecd48c256687e742b7cfafd0d3966c042c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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
  • 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://jottigo.ru/strik?utm_term=how+much+is+a+commodore+64+worth PDF link annotation
    • http://xonajolonifimo.22web.org/gasukipozunaxamufikenu.pdfIn PDF document text
    • http://ketrovk.xyz/lokoradegizuruwivopir9liu.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/0hajfgf/tinilugitifawugulaso.pdfIn PDF document text
    • http://latuha.com/best_converter_for_appleir4po.pdfIn PDF document text
    • http://igclienteam.com/rainbow_rowell_carry_on_espaolcn5fv.pdfIn PDF document text
    • http://creditstar-kabinet.com/111291935332fpcy.pdfIn PDF document text
    • http://myluckywin.site/combien_chiffre_est_ria_nombre_de_trdo3bc.pdfIn PDF document text
    • http://lnstagramcentre.net/john_lewis_radio_controlled_alarm_clock_instructions39paf.pdfIn PDF document text
    • https://cdn.sqhk.co/pagupuxu/BM2sghe/72275748568.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/hiiaqhb/holy_book_quran_translation_in_english.pdfIn PDF document text
    • http://help-bluebadgecenter.com/90572910466u33f.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/rikolesafuwofar/fesuxuzi.pdfIn PDF document text
    • http://guwaduroredidaj.rf.gd/mathematical_coloring_ornament_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/wozejana.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/59354151076.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_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 5444 bytes
SHA-256: 7479a270f7667522c2c949a74a533d6c58895bbee990075fe5dfb71b54898049
font_01_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 11284 bytes
SHA-256: 10987d665ffb12dd9afd7ac932404046c23007824e9764fdf9fcaef387520ba9

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