Malicious PDF — malware analysis report

Static analysis result for SHA-256 21873d20f55258e9…

MALICIOUS

PDF

71.1 KB Created: 2020-11-29 08:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c872e12f5a87077470bc0ca7ddcc8231 SHA-1: 3f530b7b3d436db496df919190960e51bce94f39 SHA-256: 21873d20f55258e96a992711341279c3f9cb592e4cb77bbe34dfad9690bea41e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/aws?utm_term=alphanumeric+series+questions+with+answers'. This URL is likely used to lure victims to a phishing site or download further malicious content. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://gettraff.ru/aws?utm_term=alphanumeric+series+questions+with+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385206/normal_5f9486d1b8743.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/novipaliwid/kutitebenamugax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce3e68d-40b2-49d1-bda2-b07260f4021d/bejalapemaxusazikederelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a462cc8-470a-45af-b4d4-a82d58271125/xarasebofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/207d548f-33f4-4354-956f-1f8e606dd542/34767647470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca052c4-c897-49ac-9964-3882a648df4a/clinical_anatomy_and_physiology_for_veterinary_technicians.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/41487914210.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/kung_fu_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff142a1-4342-4583-bd83-22586fdaec12/the_impossible_quiz_unblocked_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b512d05-8640-485f-b97a-836fe295cd5e/93805024125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eccd3b4e-ccfa-40a7-84fa-2fd5d5c0f88f/grasslands_of_the_world_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb5f562-8466-4456-883e-5031640715c1/smart_people_should_build_things.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/89661221575.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/kexadisatuzerasutide.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_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 5380 bytes
SHA-256: d974e02f768a431e58a7031eb8a54d924c115ace44f8b504666fa3c3a7be143e
font_01_sfnt_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 10608 bytes
SHA-256: b1d51352a2ddd886cb37dfd15329d17d2deadca5be736c1113ecd992dc32b5ea

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