Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c287ba41a22e62b…

MALICIOUS

PDF

65.3 KB Created: 2020-11-10 23:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b89983b4c0647f4ff1c060d3d1cfbcd4 SHA-1: d94f2dbd1d4ad659ebafe242e92563880af9125a SHA-256: 1c287ba41a22e62b87a2fcb754bad37680c7add6b9b484f9c6bfa98305d412c2
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://traffset.ru/strik?keyword=hotmail+email+account+size PDF link annotation
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/6426396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5f8c44a93bc2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447874/normal_5faa587c49e11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f8a2377d305e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_5fa50538af9df.pdfIn PDF document text
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/7161364.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/75473bdd-e5be-4480-bdbd-1480405075a1/32642445883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed6dae0-4971-47cd-82ab-82601b97b1e3/31910507316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ce3fe4-5dd4-42ec-97d9-472f9a59a914/example_of_a_tertiary_protein.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/posozabitegojuzebozew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd379a10-f26c-48e9-8a8d-9872c2e355fb/28806850669.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_off0000c40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40B 4860 bytes
SHA-256: 2f359446b5f6dff6ff9fa65c5a2a6c6b16f8299cf6d7b406c48ec516dec609f2
font_01_sfnt_off0000d47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47F 10700 bytes
SHA-256: fa2c952ea73ca6bdaff182326d39370a6558eb70aefeb54179624d17795b06ce