Malicious PDF — malware analysis report

Static analysis result for SHA-256 36319fb072cdf326…

MALICIOUS

PDF

76.2 KB Created: 2021-03-11 09:15:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 19e8c8fd8f7f27e3ffa9f51af850ea11 SHA-1: fa6c3a2529bad6a7bc6c68c2ce6d9e3c0972cafc SHA-256: 36319fb072cdf326890768cd1adcb211f522d4db81f36b2f82f97836e49939c8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://botokaw.ru/award?keyword=teknik+konseling+behavioristik+pdf PDF link annotation
    • https://katozela.weebly.com/uploads/1/3/0/8/130874493/sifarum.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/sig_sauer_p320_x_compact_holster_owb.pdfIn PDF document text
    • https://nebikaxo.weebly.com/uploads/1/3/4/6/134655772/nuxil.pdfIn PDF document text
    • http://kungfumalibu.com/92420523714h08a4.pdfIn PDF document text
    • http://tk-pobeda.site/funajexijegujuzituiozld.pdfIn PDF document text
    • https://larekupexog.weebly.com/uploads/1/3/4/8/134884129/7268940.pdfIn PDF document text
    • http://xonigej.mypressonline.com/white_and_rodgers_thermostat_manual_1f78.pdfIn PDF document text
    • http://vexezujuzas.scienceontheweb.net/electrical_instrumentation_textbook.pdfIn PDF document text
    • http://newyearshop.site/aprendizajes_clave_preescolar_lenguaje_y_comunicacion63ckm.pdfIn PDF document text
    • https://safipeta.weebly.com/uploads/1/3/1/4/131408280/jofapubulix.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/lasekizoxexonuxi.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/fefurorobumi/11611923523.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/a_series_of_unfortunate_events_characters_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/24401825863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2484dbb-47b4-425e-b52c-9a65860cc2c1/kixotepafez.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/57827831565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/137e82bb-a483-4004-aa0c-08a941058197/nowoxovoxerubisimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66152128-a51b-4c05-9ea5-b9689de1c81d/10782040562.pdfIn PDF document text
    • http://zorikeroz.onlinewebshop.net/rozig.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_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 5516 bytes
SHA-256: 5a6494202204699663db9b604a07e6388ac0b9c7d13543124de1c27ffbe1ca38
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 10176 bytes
SHA-256: 545a673ff540ca752d6d5bcd8c19a1a35205ca4fb2397f0d79fba3049410f7e6

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