Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec8d8c6dd80970d…

MALICIOUS

PDF

70.6 KB Created: 2021-01-09 03:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3e7799f7417e9acb6dba86c5e82dc975 SHA-1: b16ca525ed9b92c4cae87d01166bfaef627332b2 SHA-256: eec8d8c6dd80970da9b5b3c7bdea62e52cb8fd963d328d49bf138c585e798e13
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'trafftec.ru', which is likely part of a phishing or malware distribution scheme. The PDF also contains a link farm heuristic, suggesting it's designed to host numerous external links, potentially for SEO manipulation or to spread various malicious payloads.

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 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://trafftec.ru/123?utm_term=elsevier+veterinary+assisting+workbook+answer+key+chapter+8 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377908/normal_5fd78fc195664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f910cdbe8926.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/1OrZiac/stampin_up_autumn_days_card_ideas.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/rorinop_dopapapezavub_jatebar_tofepuxi.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/votubukaxogilix/the_lighthouse_full_movie_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/publisher_brochure_templates_microsoft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7cda103-1022-48e6-af40-18ed7482c0ee/funciones_y_tareas_de_los_ordenanzas_y_conserjes.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/activator_methods_protocol.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/schwinn_quality_biodyne_performance_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e7b6aad-392e-4a3b-8e4d-b1dc5d4047fa/87481171333.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/label_maker_online_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/allshare_cast_windows_8._1.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_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 5804 bytes
SHA-256: fa86112b26c9e6c8d6e8b6bf5658bda04309072461b0fa4d400509b1be8b16ca
font_01_sfnt_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 10476 bytes
SHA-256: b9e9079404e14d9feba6175e6e04902aa542a042e8cdde8a6d1232cd478da597

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