Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d59f40b83897bc0…

MALICIOUS

PDF

73.8 KB Created: 2021-03-09 18:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dd81b11c21d49a4c4c75b5de17e23dd7 SHA-1: 2c0f82a0933ed3fabd8b5c87da9bd95e4847af25 SHA-256: 3d59f40b83897bc08ecf2d71e898a4d055de2e4c072b044139b25b8a525098b0
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as a link farm or redirect to malicious infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=graphing+and+writing+linear+inequalities+worksheet In PDF document text
    • https://static.s123-cdn-static.com/uploads/4459337/normal_5fcf80ab530c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5fdc1a0cc5558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416506/normal_6018da2066c27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451229/normal_5fd8a1441fbd1.pdfIn PDF document text
    • https://nefosedinipal.weebly.com/uploads/1/3/4/6/134698739/fixuxovitekenisan.pdfIn PDF document text
    • https://figusemaf.weebly.com/uploads/1/3/2/6/132682639/275391.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476011/normal_5ffba54b4822e.pdfIn PDF document text
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/vitokaruxugikigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_602411266e1c2.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/fudezenapojaraw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484835/normal_602c3250d1897.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381766/normal_5feeb4d1ea5d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_0a4a08a6d20f4bf7ad365b098fb85ff2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/percy_jackson_movie_3_watch_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/brightness_control_software_windows_7_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/zoxifatukikigamokoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/64674445849.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/52159288663.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/how_to_install_sims_3_on_mac_from_origin.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/coppelia_mazurka_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/drakor_hotel_del_luna_bioskopkeren.pdfIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_10bca075d2bc437c991d173b3c5265a7.pdf?index=trueIn 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_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 5532 bytes
SHA-256: 9633699cb4b8395f687efaab9ab20d4d6864e5716eae74e081bf37c28e0c2505
font_01_sfnt_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 10360 bytes
SHA-256: 6ddf73cc342fa503f8decf3b62c07b3b778b0cfcad56d6ae5a83c0089e3b5ef9

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