Malicious PDF — malware analysis report

Static analysis result for SHA-256 533d04ee291d21df…

MALICIOUS

PDF

75.5 KB Created: 2021-06-08 10:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b6096b94acaa9f4034f36eea718871a SHA-1: db87ae6bc3b9133efe9607b11403e1d67b0bdbcb SHA-256: 533d04ee291d21df8871332c5496dc166694f097d302fabaf8e66c703ec008d7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The primary external URI points to a URL that appears to be related to news content, likely a lure for phishing or ad fraud. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/pbw?utm_term=goal.com+chelsea+latest+news
    • https://cdn-cms.f-static.net/uploads/4478703/normal_601d511acb4ad.pdf
    • https://julavatevimire.weebly.com/uploads/1/3/4/6/134669339/nuguzuxu.pdf
    • https://buzotifosu.weebly.com/uploads/1/3/2/6/132695554/dupigokogepil_gidelefat.pdf
    • https://cdn-cms.f-static.net/uploads/4450870/normal_601b912259518.pdf
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5fc8b30759b3d.pdf
    • https://static.s123-cdn-static.com/uploads/4500889/normal_5fc8975e56864.pdf
    • https://static.s123-cdn-static.com/uploads/4455660/normal_5fec8c7797c24.pdf
    • https://regajuwanuduxis.weebly.com/uploads/1/3/4/3/134319991/2455785.pdf
    • https://niromegezos.weebly.com/uploads/1/3/2/6/132681660/tutesizazuluzabega.pdf
    • https://static.s123-cdn-static-d.com/uploads/4407314/normal_60b3b8264e51d.pdf
    • https://misefumod.weebly.com/uploads/1/3/2/6/132680918/wolopixilodo-xumemodebetu.pdf
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/1608373.pdf
    • https://static.s123-cdn-static.com/uploads/4425217/normal_5fced09618d65.pdf
    • https://static.s123-cdn-static.com/uploads/4376878/normal_600916326b175.pdf
    • https://cdn-cms.f-static.net/uploads/4450156/normal_60278a0ff11fa.pdf
    • https://cdn-cms.f-static.net/uploads/4485010/normal_6037475dc027d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/89817ca3-6cfd-4153-8501-bb40843b834c/why_is_my_swamp_cooler_not_getting_cold.pdf
    • https://uploads.strikinglycdn.com/files/b53ada8c-d219-4d95-84c4-46c1b7f7cbe0/detixetoju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e925.bin
059ebf922f64b5aa8f79d619c799f3cfb8317d8f19709c2dd40ed1cd1457bb76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 5100 bytes
font_01_sfnt_off0000fa6e.bin
dcac50e439b563771ded9b946a398e129143297ed203642f9f1cd4eb2eaec18f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 10868 bytes

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