Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b28561d31e4d7b3…

MALICIOUS

PDF

69.9 KB Created: 2020-11-13 21:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d61e4cf8a5a0bec33f63679503fcd531 SHA-1: 91dfc2b00ad631d8c4e9c93b49ba4a72bd2b33c1 SHA-256: 3b28561d31e4d7b3d114f5a114759e2d7b95d92c137446ae1ba91c81dd280ea8
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 'ggtraff.ru'. This, combined with ML classification and ClamAV detection, strongly indicates a malicious intent. The embedded URL is likely used to lure the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/123?utm_term=nominal+ordinal+interval+ratio In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5f8a88fcc0278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424011/normal_5f990fbac2aeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426260/normal_5fab205020a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5fa34b02a9a88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_5f8cacef2d254.pdfIn PDF document text
    • https://wegupufula.weebly.com/uploads/1/3/0/8/130813429/1636105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_5f9fb8dbd9e2a.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/lerepomuxe.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/sejivepigogetu_fefab_dotarenezona.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/xapidajovaji/78486615379.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/10_canciones_infantiles_letra.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/atresia_esofagica_en_pediatria.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_off0000d5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 4824 bytes
SHA-256: e9849bf308dbf2255036f7313b9ac6513450756fe46ff0970831e4fb8f0c6d99
font_01_sfnt_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 10840 bytes
SHA-256: 6f40bf3e3476d85626234d3c06c989f98fbcce8ff77eb1bfd31b64d6448eb778