Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3755e70bbb75463…

MALICIOUS

PDF

96.6 KB Created: 2021-05-06 01:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a67aba28f3cccf95ec45e423368ce9a4 SHA-1: 27b35d57e1f6d4c73f5d9f03ed3c2bce0bfb0adc SHA-256: d3755e70bbb754634f4e4e9d8d8e85ac6fb3bc63d108d3bf5a94d2eabbcc7934
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that redirects to a link farm on disposable hosting, disguised with a search term related to a children's show. This suggests a phishing or social engineering attack aimed at directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/strik?utm_term=slugterra+journey+to+the+eastern+caverns+part+7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456166/normal_5fd139c13761f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452599/normal_5ffb56e522eb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470226/normal_5ff348a3b992e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470399/normal_60402d3ad8bbd.pdfIn PDF document text
    • http://kleomaften.online/nexumemesibaletitbq49.pdfIn PDF document text
    • http://solent.bar/xakubunifupof0f1w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_600e01d429e0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_6050b7561798b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_606e05c030e70.pdfIn PDF document text
    • http://tehnotop.space/spirit_of_the_laws_book_7_summarysfyw0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_60552e401842c.pdfIn PDF document text
    • http://souve.me/38199452685jzv30.pdfIn PDF document text
    • http://cetop.xyz/how_to_train_for_strength_not_sizexhivi.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/036a17c3-8240-4ff0-9e6c-80e5913e4cd1/how_to_install_homebrew_on_catalina.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_9caab2fdb938408ea9f47c84881be47a.pdf?index=trueIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_e4f24c210eaa427fb09a9dc8b7646ff4.pdf?index=trueIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_6b68563ba2724b0e90cafa66bcf4f2c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f324c7-4c12-4813-882f-d96422b4265a/67388336471.pdfIn PDF document text
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_ac28abbed0584d5993df7e5c71e10f8c.pdf?index=trueIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_1ef2c18b40fb4088b82506b51bae3efe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e649cb6d-a713-4b3f-8e99-5254a4fa292e/preface_to_lyrical_ballads_summary.pdfIn PDF document text
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_638a9444219c4311be34a3e7243fa3fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e10a833-c1f3-450b-83b2-f4be1016f860/24160978605.pdfIn PDF document text
    • https://fb1cd387-549b-40f1-a5a4-67fd65d29bb3.filesusr.com/ugd/4200b4_d4aa41d885684047b002ba8acb00b093.pdf?index=trueIn 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_off00013c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8F 5616 bytes
SHA-256: 3ef3b6695ae287ae20ba9364186d3a01697a4166096eeaa1aa5b2e0fe8de649f
font_01_sfnt_off00014fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC1 10824 bytes
SHA-256: 308e1b4591a70bbb0b6382764092979f494df61264bb9a5f31d5f0cfd5093046