Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32d82a1bd72a38c…

MALICIOUS

PDF

60.6 KB Created: 2020-11-17 01:21:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5f416c45ad03006840c21ffc9986ad01 SHA-1: bb4d3255a9df0bd7799436cc2715b40fa27880b5 SHA-256: a32d82a1bd72a38cd15aeff6abc37400675f67232db24018d6d7358cb0c6d01f
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 0.9996

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://trafffe.ru/123?utm_term=alfred%2527s+essentials+of+music+theory+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369903/normal_5f88ad91b1e30.pdfIn PDF document text
    • https://fipokotosa.weebly.com/uploads/1/3/4/5/134506619/8ba598d05ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f8a6e7c717f2.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/sapag-pumeda.pdfIn PDF document text
    • https://dedofuzogod.weebly.com/uploads/1/3/4/3/134374436/f8a0efe3b5818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fab8e81cbeb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_5fa7fc63a6a5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f86f73c02832.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/fajonubinomeder/compare_numbers_worksheet_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a13122f4-528a-40eb-9e4a-da5e5f575e38/bexokasasuwazalizik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0412ae58-d56e-44f0-affb-7615ec779ec9/psl_2020_live_streming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2bceab0-fecf-4329-8be0-53ab005c7400/41181545140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f079f90-21db-405e-91c8-77dc4abca135/13363336617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904c6223-15af-4900-9331-fb912391713f/82600460490.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_off0000b142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB142 5612 bytes
SHA-256: 4c15426e5b3f48949dfa3ebdc679dd4b7276ed8c17ef0f2359733e51f2b7f018
font_01_sfnt_off0000c44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44D 9632 bytes
SHA-256: 7c0906a2cb067b154a536a8c6271422ce58db3518c481ac18bc55f07f6f478bf

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