Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3e5f36ece73452…

MALICIOUS

PDF

69.5 KB Created: 2020-11-21 12:30:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 992702ec393f895b1266ed67ce50a4a7 SHA-1: a056b3cd880c76610384dd20c52a02493b1e3b59 SHA-256: 0f3e5f36ece73452a6528e9fe7a47234b5bff708ff107b9e640300ebcb28fb17
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with the primary malicious URL being traffset.ru. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'urban dictionary' and contains embedded URLs, indicating a likely phishing or malicious redirection attempt.

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=bump+into+urban+dictionary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445735/normal_5fa54b12c86a0.pdfIn PDF document text
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/7611756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_5fb459888d6de.pdfIn PDF document text
    • https://pukuxenusafo.weebly.com/uploads/1/3/4/7/134711282/kolutubim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_5fa3f0c40a510.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/87dd1859-abca-440d-b0ff-279543fa1c14/vofedi.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/technical_english_3_course_book_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f2c07a-e696-4aba-b64f-30a114200834/size_of_google_form_header.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f646eb9f-88df-40cb-89dd-9094da89688a/najed.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/duvuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2024462-54d4-4faf-bff0-8b18b0220e17/37291743490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb43b57-2b61-4eb0-bd92-c57104f8936a/24691191451.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_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 5300 bytes
SHA-256: b98348d6c4ea2c48eb08f007c4dd4b9b61ccd004873979469c875bd770edf3a8
font_01_sfnt_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 11236 bytes
SHA-256: 8c1d51a317e823824b4e56ab17ddc983c0c54d259183dd43a4e35e24cf3a364d

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