Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2aa4a8263bc921…

MALICIOUS

PDF

71.6 KB Created: 2020-12-15 14:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c55c8540b8a903162498592e406c1524 SHA-1: 9f7254b7aa26146ce52ed6854fe2463ae46abfdf SHA-256: 4a2aa4a8263bc92170d4f9bf77a5ef6c26e5203c055590f900030ef685d1ce06
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and it contains heuristics indicating it's a fake invoice or payment lure. The document body, though heavily obfuscated, contains text that appears to be related to legal or financial matters. An external URI, https://traffine.ru/123?utm_term=estado+de+derecho, was extracted, which is likely the malicious payload delivery URL.

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffine.ru/123?utm_term=estado+de+derecho PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370307/normal_5f941f0ea7cc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5f8bef8ddb618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5fa1ed0326e55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_5fb32c37152a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_5fd7508460f01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450047/normal_5fa5691d16a53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_5fbaf9047fa8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484363/normal_5faaa74fe225f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0cc948139af037644bbed/t/5fc0e273e6d49a06bbb2b985/1606476403979/quadratic_problems_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13274cd1e280355d63052/t/5fc6bccbc7c45a5eaf8e68e4/1606859979844/bingo_wings_surgery_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/kazewaki.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/season_20_witch_doctor_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/39929018982.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/zowoxupabepu.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_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 4952 bytes
SHA-256: 93287b82d57566546e728832fcf1a801bf7b071e8f6285f014cc196799fecde9
font_01_sfnt_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 11124 bytes
SHA-256: dc381d676179bf93b66ca0cd996fee58ad3c5aa3c8fbaf343144d79e54565460

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