Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9de7bc2b75da7c4…

MALICIOUS

PDF

76.3 KB Created: 2021-03-05 23:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5c23fae52fb2c9107ae958bba33ea7ef SHA-1: 4bb64e14b7edc8ad3777e80c1d0201b59fdd6390 SHA-256: d9de7bc2b75da7c4d512a27a953d38deb8bf2528d4e9f4441531dfaf6fd4b843
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, a common tactic for link farms or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://dugedepap.ru/wix?keyword=oroonoko+summary+litcharts PDF link annotation
    • http://bupetud.xyz/a_voided_check_defineuo2e8.pdfIn PDF document text
    • http://suzuxef.22web.org/junapevejokaruxabidufa.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/hfqpgjt/skateboard_party_3_pc.pdfIn PDF document text
    • http://reabook.online/jiponulunipauaxm0.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/dXkAehb/vuvirepixalajun.pdfIn PDF document text
    • http://salonhq.xyz/up_board_result_2017_class_10t8rn4.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/vanatul/kasexojoxided.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/mukagik.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/febuwosevota.pdfIn PDF document text
    • http://nazifaba.rf.gd/tiditunixivazi.pdfIn PDF document text
    • http://pujusojup.epizy.com/electronically_sign_online_free.pdfIn PDF document text
    • http://sitotozip.rf.gd/lake_mead_crappie_fishing_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/86798656754.pdfIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_9158a3467e2b40e097a5e4a14897a99a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fasudikek/the_legislative_branch_congress_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/how_to_create_email_signature_template.pdfIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_7a03b1a7ba3646f19910fcbc0a666bbf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/latufenaw/17285759170.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_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 5232 bytes
SHA-256: fd2ab167f69cfa008c4a25c1a03ba68f0cbf1a23222a52e29d73461605658848
font_01_sfnt_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 10000 bytes
SHA-256: 11c36eda59b21f94060e602009f8b3011da2166319654b48533e24b2a92f7651

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