Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2db1101540ecc2e…

MALICIOUS

PDF

68.4 KB Created: 2020-11-10 22:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4ef2f3f987636f4850182678b35f111a SHA-1: 87d019a1ae384ff0149feeb0e7cb8692e4c7e992 SHA-256: b2db1101540ecc2e53358c43df3d97b371e6022062d3d6f1843e4941a3fff9c2
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with one pointing to 'traffset.ru', suggesting a phishing or malicious redirection attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?keyword=sanshou+san+antonio+tx PDF link annotation
    • https://sajenaviwabawi.weebly.com/uploads/1/3/4/2/134266368/tilekujibem.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/sorogamat/saxesumekijimimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69876ad0-eba7-4022-8f66-23cdaa8fd8a0/nurse_practitioner_goal_statement_example.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/55846104750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc9b6141-6a68-42ef-b698-2e8e97cfebe1/luwuruzirororofego.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/notak.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/arindam_chaudhuri_books.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/46785869254.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/eic_worksheet_a_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/41686560224.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/41722311588.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/form_style_and_meaning_in_byzantine_church_architecture.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_off0000cf4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4D 4816 bytes
SHA-256: 43e63a713905f537ba9c77b2082ef69d888f132b1905913577c0037f81495470
font_01_sfnt_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 11012 bytes
SHA-256: 90c4053bd9546f34d40aadb594accc74bb3a561291b32963922551fd9f2f3825