Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4375aabbe14639…

MALICIOUS

PDF

77.2 KB Created: 2021-04-21 03:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 695fc69e145c602da04b2703ee82223d SHA-1: 857aa549bcd10dda971c91442fa2160a38e2046b SHA-256: ec4375aabbe146399103c5b52d496bc6976822ae00d35de619b3c8f5e5ca96e6
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 0.9998

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://dugedepap.ru/strik?utm_term=spectrum+tv+remote+control+app PDF link annotation
    • http://netewe5.xyz/lodeposataz6jxn.pdfIn PDF document text
    • https://nidoziba.weebly.com/uploads/1/3/0/8/130873853/6972687.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/hhjb0Jk/64743085760.pdfIn PDF document text
    • http://ozalupa.space/what_does_human_condition_mean_definitionzapjr.pdfIn PDF document text
    • https://cdn.sqhk.co/daboxazile/hdqppgd/youtube_face_mask_diy_no_sewing_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/tjc95je/tegosezexosimilugofodu.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/93964564471xkoqg.pdfIn PDF document text
    • http://zijaditenup.getenjoyment.net/fatobakaf.pdfIn PDF document text
    • http://fibipowokogo.sportsontheweb.net/abu_dhabi_duty_free_liquor_price_list_2020.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/civil_construction_business_plan.pdfIn PDF document text
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/zovefitaxet.pdfIn PDF document text
    • http://paripamivawe.iblogger.org/hound_of_the_baskervilles_chapter_9_summary_sparknotes.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/topipovikapari/sharp_xe-a507_barcode_scanner.pdfIn PDF document text
    • http://novoniranalisa.epizy.com/cursive_alphabet_practice_worksheets.pdfIn PDF document text
    • http://pevinojemodil.rf.gd/system_analysis_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/bapizokiraduz.pdfIn PDF document text
    • http://fetevatakipip.epizy.com/ajuba_full_movie_hd.pdfIn PDF document text
    • http://laxukumelukadut.myartsonline.com/10146486969.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/rapufopa.pdfIn PDF document text
    • http://gonumarimemax.epizy.com/vupabudedugugijufug.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_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 5064 bytes
SHA-256: c71a8122974b10284be01429502b94fd149b545ecaed5e9b03a3ce32d5ba8893
font_01_sfnt_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 10580 bytes
SHA-256: 860dd90da4953ce5b26f2a326e75767a95aa18703aeb973ea3eff82348d00647

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