Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a011142b0d9def…

MALICIOUS

PDF

74.2 KB Created: 2021-04-04 19:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 592d8eb308b741e33f621c3f50fd6901 SHA-1: 1b16de63a9aeffa453afe9a500ff6e7b458056bb SHA-256: c4a011142b0d9def7f3013341c892760f8b10040957225840932174e97a7a320
126 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content.

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://xajibur.ru/award?keyword=because+so+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/fikalibumi/Egijcic/32937670644.pdfIn PDF document text
    • http://xodikiz.iblogger.org/cnidarian_diversity_polyps_worksheet_answers.pdfIn PDF document text
    • http://pepufur.22web.org/69683026039.pdfIn PDF document text
    • http://brumbum2.xyz/apple_music_app_apk4mkfv.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/3a1ghGc/city_building_games_xbox_360.pdfIn PDF document text
    • http://usmileofficial.site/vw_service_centre_bristolfma2j.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/qFhicgd/elton_john_songs_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/rurizibaxami/ijLM1ib/mufoliguwubosejozole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tufomatewivade.rf.gd/77171693014.pdfIn PDF document text
    • http://nogevewibavulur.epizy.com/32577635128.pdfIn PDF document text
    • http://jenimubi.rf.gd/99292444065.pdfIn PDF document text
    • https://92fbd7ca-8480-4723-bb2c-19523f9dca15.filesusr.com/ugd/29946e_928d48456955447c926ed1740bd8e6b5.pdf?index=trueIn PDF document text
    • http://lerapavuzuloz.epizy.com/67321115914.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/sobupufuzilorajijogovo.pdfIn PDF document text
    • http://vawujularow.rf.gd/tarejonodamupexez.pdfIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_5cc0cdc93bd44114a55b424d34be48af.pdf?index=trueIn PDF document text
    • http://fuzaxovojige.epizy.com/standard_dachshund_breeders_california.pdfIn PDF document text
    • http://pemisikozawefa.epizy.com/bi_weekly_budget_sheet.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 5416 bytes
SHA-256: 994a938cd4902b0590771b5ad5a4eb9c176818f0bc0407398be132abdf918e87
font_01_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 10308 bytes
SHA-256: f304bea5d2dd7e82c50efa9f997a2401c5614d17c36bd0833261e066090b6f8a

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