Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a37386fba8f9a8d…

MALICIOUS

PDF

82.4 KB Created: 2021-01-21 14:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6b653c669c63e3625a14fe184b427a66 SHA-1: 772dad971cf054e97b48ca4b60ad6721d6732de2 SHA-256: 4a37386fba8f9a8d32dff8a1d91c491de799d2c76e3eb97f849d18a107e56779
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to potentially malicious content.

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://maypoin.ru/wb?keyword=treasure%20hunters%20tv%20show PDF link annotation
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/sevanuretax.pdfIn PDF document text
    • https://site-1171753.mozfiles.com/files/1171753/download_blockpost_mobile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467038/normal_5fa9398c3ab40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5fda027a89f64.pdfIn PDF document text
    • https://site-1171487.mozfiles.com/files/1171487/quiz_maker_software.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478131/normal_5fc837594edf3.pdfIn PDF document text
    • https://site-1178383.mozfiles.com/files/1178383/74391808228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421061/normal_5fc4338ac03c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447079/normal_5fc0516ba3b6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374185/normal_5fc917492e7a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489734/normal_5fcceff592b3f.pdfIn PDF document text
    • https://fojojaroj.weebly.com/uploads/1/3/1/4/131453509/1639c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f8709fb687ed.pdfIn PDF document text
    • https://venefosek.weebly.com/uploads/1/3/1/8/131871910/7262443.pdfIn PDF document text
    • http://kekemubitaf.iblogger.org/modofijuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393488/normal_5ff5f65f6d2ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410722/normal_6000677640463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_5fb812c015a8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_6003bc3252d4d.pdfIn PDF document text
    • https://site-1177757.mozfiles.com/files/1177757/90709380455.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pitikepaz.epizy.com/19129786256.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 4676 bytes
SHA-256: f1baebb7d099c756b7391cadc7acbbb5fcc7df7d23911839ec7271245d21abf7
font_01_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 10712 bytes
SHA-256: 7603803fe9628b9eb162bdf3d3dca0d6efffb276877407f9075f4470e3fbd768
font_02_sfnt_off00012cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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