Malicious PDF — malware analysis report

Static analysis result for SHA-256 b744c34e014cc9a5…

MALICIOUS

PDF

93.5 KB Created: 2020-11-13 15:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5d06110984cb774b8c1e90f8b39d0fc1 SHA-1: b710b88bdde8938c7a39a44ceee1213dc131afa4 SHA-256: b744c34e014cc9a595b97115fa1d6c0aeae9537053780b35a5c61ed1ac267dcc
156 Risk Score

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 0.9997

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://traffine.ru/aws?utm_term=seventh+day+adventist+church+heritage+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416790/normal_5faa674d0aedd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f8732a2cb8ce.pdfIn PDF document text
    • https://bilimetib.weebly.com/uploads/1/3/4/4/134435282/6678376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421061/normal_5f98151d36ed7.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/9055391b-01b4-477c-9be7-4f4eb156fd5d/9001866094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03f45d8-ebd9-44c6-a5a7-b8a474686e71/logo_modernism_jens_muller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e45a85e1-c0c3-49dd-8aa3-7d30d9d49125/coffee_prince_9vo0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e95057-f5c1-4ad5-a2c6-27d5611654ac/99520968870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f59b1627-ef0e-47dc-8eae-916cbee50c64/59795684154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/137c1b4c-cb0a-4a42-b328-c2735e118459/jakejojufufuzamimiduguzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fba8f05a-af15-43a1-ae6c-c3908d0bcef5/nodudena.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_off000130c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C7 5648 bytes
SHA-256: 4c4fc8b68711e2c77a22dbb1cf1c27464d52edfa2a2ed78ee64d170edf5b3bc2
font_01_sfnt_off0001440f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440F 10808 bytes
SHA-256: 3fb2acf016b9dd72331a49111800d36aaea485e202f391568561ab0027ae24d0