Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d18d6bd69bfcd4…

MALICIOUS

PDF

72.8 KB Created: 2021-03-17 00:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 367ea46df4a8832cd25c0a22364c74b2 SHA-1: 1cc9f8706b35de2991854dcf399eab4c4295af19 SHA-256: c2d18d6bd69bfcd4ee0ce800f6e4546d58507b48129ebfb33fc3af87fb8802ed
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 an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The primary URL, 'https://nipisod.ru/award?keyword=png+school+calendar+2020+pdf', is likely used to redirect users to a malicious site under the guise of providing a calendar PDF. No scripts were extracted, but the extensive linking and detection results point to a phishing or content-scraping attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=png+school+calendar+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369332/normal_601bde47a9b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_6025008b6db9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_60339e512343d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_600def2627fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449781/normal_600ccd42956dd.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/dWrUjiq/xiwovirafobu.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosudav/tjjETih/heart_rate_monitor_watch_apple.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417986/normal_5ff260b9a449e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sepawi/timigimebenifanelude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e3a296-3d45-4d43-bcd9-537595c614db/xavenuzafatedenotunijasi.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/email_template_for_delayed_service.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/calculate_time_difference_in_crystal_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d41b247e-aca6-461f-aed2-edaf6b2b9b6e/surah_yasin_full_ayat_rumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16fd3ed6-bea5-48ce-a393-9f57e7d570f6/22906876006.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/60125574630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44abcb38-bed6-4403-b7cd-bf0294da8651/baxiviru.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_48a8fc3d76b74ec4a4fbe62e59c416a8.pdf?index=trueIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_2ae969b289934af18f0870e7308e7e78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b49940fd-1f8c-4ee6-bf23-b756ef8e1022/tekinafonufizuda.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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 5692 bytes
SHA-256: f65c1300eca944ec68b1f400b63e8787cb139eb52a5bdd29c48c15d17ed51015
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 10876 bytes
SHA-256: f822881af6a46cb41014455909d64f85a3f2412d5013f29b98dd9d8a332eab1e

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