Malicious PDF — malware analysis report

Static analysis result for SHA-256 974c2848b8cec344…

MALICIOUS

PDF

67.6 KB Created: 2020-11-16 15:29:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9c6d9c1d584ca081bdd840b093f37d70 SHA-1: 90fe156f3e7d2de8718c5b533f4054116e3483fb SHA-256: 974c2848b8cec344f6a47b875d694417b3bca6d8946996ca1586df552279bd64
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://traffset.ru/123?utm_term=weather+channel+torcon PDF link annotation
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/zemirexubaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5f9504628cdff.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/bezutu/best_free_dvd_burning_software.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/mudeboturanofutawoxeronu.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/20944825595.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/opposite_words_in_english_with_hindi_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/genedopop.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/5847446831.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/77304020607.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/sasajite.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/voput.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/riwifozelosugibam.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/51879154063.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/plate_boundary_worksheet_answers.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_off0000cbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD5 4720 bytes
SHA-256: 05866a0507e8bee85ecf869ffc048486239929f4eb1353049e7bc71f01064349
font_01_sfnt_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 11144 bytes
SHA-256: b44a1f294bf5c93bab131e69ee413cbb162b5a3a357ca2950d54b7168ad3eadf

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