Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc72a747e22b3fe3…

MALICIOUS

PDF

83.8 KB Created: 2021-02-28 04:23:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e037335828e4ad8035744be71b420d42 SHA-1: 9ffc9dc5102eda242719f1277c41db201a272db9 SHA-256: cc72a747e22b3fe33d701aabd00666660667e132d575f62b9d6bbd8ecdefe308
156 Risk Score

Malware Insights

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

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 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/123?utm_term=how+to+stop+a+sloan+flushmate+from+running PDF link annotation
    • http://vvinorama.fun/honda_civic_workshop_manual_06-10wwyle.pdfIn PDF document text
    • https://nujelojebalu.weebly.com/uploads/1/3/4/6/134690198/lotapepomajura_garegusozi.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/kindle_3_change_battery.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/what_sd_cards_are_compatible_with_galaxy_tab_a.pdfIn PDF document text
    • https://firajapototirop.weebly.com/uploads/1/3/1/4/131452771/nosajavemodixe-xokosotufiwegi-sibakurezof-pobetaloto.pdfIn PDF document text
    • http://top-agent.ru/fixodasuxateximuvozivu1tbdu.pdfIn PDF document text
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/rusetuxilutasofowa.pdfIn PDF document text
    • http://flipping-car.online/zuxebad7dyfb.pdfIn PDF document text
    • http://hyipinvest.site/41503238590tshkm.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/7931128.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/punagilelabon/close_to_you_maxi_priest_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/visa_application_form_japan_embassy.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/buvotewuju.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/pufalakimonibox.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/advanced_excel_2010_khmer.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/american_express_uk_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/primarias_pnp_2016.pdfIn PDF document text
    • http://kejufunekopal.epizy.com/83410020374.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/japan_guide_kansai.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/variable_resistor_10k_datasheet.pdfIn PDF document text
    • http://ruxurosagogaru.epizy.com/kodasupixigupa.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_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 5368 bytes
SHA-256: f7d50f6224d22110d689a546da934516f636949d120f532687a3bba161dcfb1f
font_01_sfnt_off000119d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 11696 bytes
SHA-256: b8eb69b06ba116d8e652607403ab7a0b2b1c25fdc701e4671c7364de1a9b1ddc

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