Malicious PDF — malware analysis report

Static analysis result for SHA-256 4632ad0b83baa6d4…

MALICIOUS

PDF

71.3 KB Created: 2020-12-05 10:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6b24dcaee4c3b9554335799f89025b2d SHA-1: 1f41285ea577c0cccbc110a376b42a0f049a3a4b SHA-256: 4632ad0b83baa6d4860a25464d4e8773418aeaa7489fc996817597f34fa204ef
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. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a tactic to redirect users to potentially harmful websites. The presence of embedded URLs further supports this attack pattern. While no scripts were extracted, the overall structure and heuristic firings point towards a phishing or content distribution scheme.

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/123?utm_term=mulan+2020+film+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385847/normal_5fac4d5237490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466173/normal_5fb6045a53a56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485711/normal_5fc49b78edb52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_5fb86b3868008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413113/normal_5fbc85b9adc29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5f9cc8f0177f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5f92f5f0c3b4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_5fb2f74e7d527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f9aca74019db.pdfIn PDF document text
    • https://bobepeduzogir.weebly.com/uploads/1/3/4/6/134673546/2091785.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/e38e6ba9-035e-4fd7-be05-2b2636584416/41476081305.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/xeziwexu.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_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 4920 bytes
SHA-256: 0730e3e763dd5a7c88db8442eb42e887e5a297e5669c5549e2fd69bb3cbb7bdc
font_01_sfnt_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 10972 bytes
SHA-256: 664840043d84c8b051a6c285f4b5627381aaf94a0a6c5d928af1bd0cdc8395fd

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