Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdaa397e8c9717f…

MALICIOUS

PDF

75.4 KB Created: 2020-12-21 11:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 40b15ec55535b8e904d9cd4d824fb9a2 SHA-1: db17be39ddf2ab08f065415b75559c8496bc8696 SHA-256: 3bdaa397e8c9717ffc169b72c72047dcf06ab3b392cbda370def40f250189efb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=head+tennis+sensor+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458388/normal_5fa16d8d4a0d4.pdfIn PDF document text
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/3301544.pdfIn PDF document text
    • https://xopigitit.weebly.com/uploads/1/3/4/3/134339451/2158553.pdfIn PDF document text
    • https://tibulewozimok.weebly.com/uploads/1/3/4/0/134017320/4731570.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/7478637.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367916/normal_5fc70f39c2a66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gajakelegeza/4663152824.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/insert_worksheet_in_excel_from_another_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/essentials_of_business_analytics_2e.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/pretentious_game_unblocked_games.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/6380454271.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59ef75bcb0228a2a2afad/t/5fcffac5d2669313d1b8341c/1607465670384/bullet_echo_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8328fb85-2bca-4d85-bf57-ca7a37a93b31/20931023467.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 4668 bytes
SHA-256: 06a62854b9c3ca7585518a3c85a7a3e24d97b64186d51e5cc01f156d0fac0e75
font_01_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 11144 bytes
SHA-256: f8210992c2b7a09eb3b2d768f0116951e0ceac0ecb10121e3f77818ace9f5bcf
font_02_sfnt_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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