Malicious PDF — malware analysis report

Static analysis result for SHA-256 dedf0715d451c661…

MALICIOUS

PDF

76.8 KB Created: 2020-11-19 03:29:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d790d93898f26246b83add0551a7ab1d SHA-1: ce593f61a88f15cec3ba1178dc576dbf564e5681 SHA-256: dedf0715d451c661dc47da1cd68109ba8395d66463c7a4409fc8ab69a221ef2b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ML and ClamAV classifiers also flagged the file as malicious. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful content.

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://traffnew.ru/123?utm_term=aphg+2019+frq+predictions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5f8de39d80b42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_5f8beccccad57.pdfIn PDF document text
    • https://zavomafig.weebly.com/uploads/1/3/4/3/134356936/xonoxagodabelo_zusulevizoz_zojawi_pivurufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_5f9054ed0655b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f89b10ab0d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f87e9f13ef2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5f8e10257fe2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_5fa5d5a7eb79b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5fa5078289a4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5f88d7a24259f.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/491bd1c50455dc.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/a06d4f76-685d-4765-a197-8fb00a11723e/wrong_turn_2_movie_in_hindi_download_300mb.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_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 5772 bytes
SHA-256: 209862ab3f8134903b55296c8fae262f58911dbd7c99069196d37f02d420595b
font_01_sfnt_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 10840 bytes
SHA-256: 5bf29849f563b8d0a1d97ffe61f12f5d6d2410fe2cdc783dd70bc6505e5748d6

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