Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf21dda2a15ef145…

MALICIOUS

PDF

66.6 KB Created: 2020-11-19 22:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: dcd0f1540af5d1b7552fb7acf09c5d08 SHA-1: 1b55f2c5045fed52e3d6d7e1e5d1786380513715 SHA-256: bf21dda2a15ef14534f9b462934b5b7eeaa46ee703124a26870b23a89dcda66a
154 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for a redirector link to known malicious infrastructure. The ML classifier also assigned a high probability of maliciousness. The embedded URL https://gettraff.ru/123?utm_term=texes+pe+study+guide is the primary indicator of compromise, suggesting a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=texes+pe+study+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4462992/normal_5fa83bcab5da6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5f926cdde2962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f88d6005c98e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_5fac258f9f585.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bafb192-85bb-4669-877e-ba83f8c8ac6a/75959454638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0ae633-a5eb-464f-b9d2-f6ccd6f6622a/82504567612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f032c26-ac7b-4ecd-984e-4c90c2fa4d0f/padosan_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c6eeb7-437a-494f-9390-b11895287cc0/28255097139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc418a8-8e70-4c27-86f4-e3c3cb71306e/caracteristicas_de_una_columna_de_op.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5457df5-109b-46ad-84f7-fd79ea62230b/22348357840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39eaca5b-cf2f-45d0-b338-35ccb0c3f094/50313705110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0276d9-02be-4c61-b638-112a8d814bad/sojivogesoxinanaxebujin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1941695-2938-4cb6-9007-9065426c3d91/audubon_field_guide_to_north_american_birds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd67658b-020c-42a5-803a-95b82545863e/nutafoxezaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b720b9a2-9322-4ffb-aece-623309809f93/vadarijejewaget.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_off0000c78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78B 4908 bytes
SHA-256: 6e7dc00d5215089de61e08012ff07055cbf5ac44099a4c24d23a847ff1ecc650
font_01_sfnt_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 11436 bytes
SHA-256: d7155c7cfb59f526232c03a29107aa5823fee9ba8a53927f6f8246dc8693c09d

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