Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71ee076fc6d3bd9…

MALICIOUS

PDF

70.1 KB Created: 2020-12-16 21:55:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d61f159709b49617630cf965da3898a8 SHA-1: 975f44675223e023d38705b4e5b70b39accff3ab SHA-256: f71ee076fc6d3bd9f779b5d6ee02245206693c09517a45210023b00c195c1b79
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, with one prominent URL pointing to 'trafftec.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates the document's primary purpose is to host numerous external links, suggesting a malicious link farm or redirection scheme. No scripts were extracted, but the presence of external links and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

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/strik?utm_term=kuta+software+domain+and+range PDF link annotation
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/6365141.pdfIn PDF document text
    • https://valetakomo.weebly.com/uploads/1/3/4/0/134012509/1565428.pdfIn PDF document text
    • https://garisufusomepis.weebly.com/uploads/1/3/0/7/130740000/wiliwuferag_vemogodazal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff7f947-ad3f-48ed-be78-c4cc65daba95/black_bullet_characters_chibi.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/fakejaxofawe.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/97613771733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec55ce9-09a7-43b2-bdb4-f5b5203d44aa/medical_student_survival_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1e09fbdb33045eec91c30/t/5fc70719788a962b7c252f52/1606879002699/space_cartoon_images_black_and_white.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/react_native_action_sheet_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78406175-2d9a-4993-9aad-ab9885802094/11987378296.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/correct_answer_artinya.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/58069701897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c844379a-45b8-46a9-85e1-ca6ed2355750/tiffany_lets_make_a_deal.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_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 5256 bytes
SHA-256: 47ff90f99aada1e21fe69d5feaa3b1976752256835685bae519d2e0dea75e674
font_01_sfnt_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 9368 bytes
SHA-256: 39d604735f8385db9c269429d8ec8f2e5fbd9a0782d0f0b60aa5ee974bd34473

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