Malicious PDF — malware analysis report

Static analysis result for SHA-256 a734ee0e3e7c80be…

MALICIOUS

PDF

86.3 KB Created: 2021-02-28 06:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0adc44ae25d836547ea56da2aef5ef54 SHA-1: d5dbc7efcfb9492aae1770fffcc99b2c3acf7009 SHA-256: a734ee0e3e7c80be78b214a1e5e8eabb96ec1daada33c0360e6ce6133e975d62
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains a large number of external links, many of which point to seemingly random PDF files, suggesting a link farm or SEO spam operation. One critical heuristic identified a mass external PDF link farm, with the first URL pointing to a file on an AWS S3 bucket. The document body, though heavily obfuscated, contains keywords related to popular culture, likely to attract search engine traffic.

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 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://bologen.ru/aws?utm_term=batman+the+killing+joke+netflix+release+date PDF link annotation
    • http://boxapad.22web.org/sujefuxeze.pdfIn PDF document text
    • https://dibarovufi.weebly.com/uploads/1/3/0/7/130776786/kimotoju.pdfIn PDF document text
    • https://bevowodawalejap.weebly.com/uploads/1/3/4/3/134363876/refatulefiragew_samunizudipi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402710/normal_60010bd9bb2dc.pdfIn PDF document text
    • https://notemuwos.weebly.com/uploads/1/3/4/7/134717082/b91d28db3942.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/nonabafat/76039267247.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/konica_minolta_bizhub_c280_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/duduvufunisugomogumimo.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/tiwimewibixutu.pdfIn PDF document text
    • http://koponobazad.rf.gd/lean_daily_management_for_healthcare_field_book.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/43188984140.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/orcad_cadence_virtuoso.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/google_analytics_for_android_and_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/33673715674.pdfIn PDF document text
    • http://rulegakufokuz.rf.gd/problemas_de_porcentajes_1o_eso_resueltos.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/deck_the_halls_sheet_music_trombone.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_off00011312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11312 5580 bytes
SHA-256: 7b6f2e5a0375c903e18fa8d271ee472d24441e1395a4ef86f2bc58e4535d5b8a
font_01_sfnt_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 11364 bytes
SHA-256: 1f20de567306227aed28e98843187d9b90b1502fb6a133b941b4370b30f084d1

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