Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f4abb2b13ea441…

MALICIOUS

PDF

75.0 KB Created: 2021-02-23 22:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0864ecd4db735b1021e3d482a04a6b73 SHA-1: 35001353b47ec49be9c72f59775de956a476f0a6 SHA-256: 74f4abb2b13ea441123425f28aa10c498d4ea7748b4a5a1502ec788cbd132e6c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of a large number of external links, particularly those pointing to PDF files on various domains, suggests a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://leonvi.ru/123?utm_term=what+is+the+main+idea+of+beauty+and+the+beast PDF link annotation
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/nirusovilorogu.pdfIn PDF document text
    • http://reduslimitalia-official.website/penguin_readers_chomikuj49lvn.pdfIn PDF document text
    • http://regsenatvumen.website/berg_furniture_assembly_instructions6tybh.pdfIn PDF document text
    • http://avtoshkola-region26.ru/oster_digital_toaster_oven_manualdi5mj.pdfIn PDF document text
    • http://enots.space/arachnids_and_insects_dichotomous_key_answerssdczn.pdfIn PDF document text
    • http://fotuxeji.iblogger.org/4849553994.pdfIn PDF document text
    • http://8gusevshop.website/ragudazizuwuvo4mso0.pdfIn PDF document text
    • https://rajilogibakew.weebly.com/uploads/1/3/5/3/135326989/kowenidizunagu.pdfIn PDF document text
    • http://sayseedokg.com/candy_crush_soda_pc_windows_10xc986.pdfIn PDF document text
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/c6ff4e7b583954.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383444/normal_5fc85b4db9411.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xelilurezo.epizy.com/22975534947.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/salvation_army_donation_guide_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/67437975553.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/wapanadubom.pdfIn PDF document text
    • http://serepuzokoz.epizy.com/93286377508.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/biposafovatirowef.pdfIn PDF document text
    • http://joriboka.epizy.com/46827818701.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/finding_inverses_algebraically_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_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 5276 bytes
SHA-256: 06e4a9457ce1cf91b24bd60238edc05ac1a2eeea1903c12c345f1641281ffe7a
font_01_sfnt_off0000fa63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA63 10704 bytes
SHA-256: 60317e72eb4b74570405344c159b1c28d39975d836c9035ad848969464f7c50d

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