Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fc2b45cd0b98f6…

MALICIOUS

PDF

80.8 KB Created: 2020-12-16 21:35:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 053287448e4237ec0301bba96cc976be SHA-1: 9b4d7c9a7ec8af892ce07cf32cf10011c40e3275 SHA-256: 37fc2b45cd0b98f6b741d08d04087016ca2aee00d58d9448c905109ea4bf5808
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 file contains a large number of external links, many of which are disguised as educational content, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to redirect users to potentially harmful websites.

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=lesson+13+sentence+completion+answers PDF link annotation
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/xepojukiputegasewog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_5f990042ce829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5104c9698b02c7f3b6a9a/t/5fc579874f9837572098b976/1606777224294/60458648215.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5683e8787e879898a19a4/t/5fd0f324fe3dbf10f3f9e622/1607529252518/rc_car_parking_2_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4c14b27a199023ace2433/t/5fccc51e5177ea328cbf92b2/1607255327614/69694256068.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7a2a4f9cd615d7ca8f756/t/5fc8977343b29e7a5af9852f/1606981492191/free_movies_and_tv_shows_online_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79b152da0933358952f14/t/5fc967cecd60ed0312146247/1607034831475/black_metal_word_wall_art.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0de9c5bcb0228a2825217/t/5fcc6245260a660a6bd22093/1607230022479/35678187883.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf15679c08c7f2b9db066/1606218071544/75575193162.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64fc43398ff7515529cec/t/5fccd087a87f9f1b19d74c86/1607258252218/52398367626.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfb2312cf09257bd651d14/t/5fc9c669cf87d0256fecc6d2/1607059051683/2499304593.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_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 5328 bytes
SHA-256: 99ca2b0dbf839d4cb4e57df7e15cb6f13295d71000dd15963e66fa50918f0ed6
font_01_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 11840 bytes
SHA-256: 04afcb34b16d0495d055d292fddf3b7ecc8981d02db9ec81fab2d314735e20d6

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