Malicious PDF — malware analysis report

Static analysis result for SHA-256 590e16b2b0cc94f6…

MALICIOUS

PDF

80.6 KB Created: 2020-11-23 21:35:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f6f161faf271498be0097f66f2c50fb4 SHA-1: 9ce2b0f7a407d5b9d2de4c48aa6cf78de011975e SHA-256: 590e16b2b0cc94f6eb0b0cc5b55db4ee2e8a50ed6eeb38a384dd6a04cdeec8dc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

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
  • 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://traffking.ru/123?utm_term=chemistry+regents+june+2018+answers PDF link annotation
    • https://bikonate.weebly.com/uploads/1/3/4/7/134715396/karowiwejatobuzarej.pdfIn PDF document text
    • https://bidutujube.weebly.com/uploads/1/3/4/4/134403342/vinamamo_gidiru_kidubi_wawaza.pdfIn PDF document text
    • https://fafefojesuvun.weebly.com/uploads/1/3/4/6/134651362/2c2c1fe5eded.pdfIn PDF document text
    • https://vumuzasal.weebly.com/uploads/1/3/4/5/134586685/6136000.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/fibawubaxavuvabu.pdfIn PDF document text
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/ffc40040a9e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/takateg/run_an_executable_file_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/nevevabosexibafelizalak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697b0af4-62c9-44f2-b3ee-43914df96b00/tamil_child_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/deadlocked_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/xulezidaga.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 5764 bytes
SHA-256: 91e880158fa29a2ae64800d98c66cd2a43d511a99d0e47c79c44d1d6b46783b4
font_01_sfnt_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 11324 bytes
SHA-256: 376ed11094e7479f9ea9aad4bb5ea5acced6ceb2792e093cc117e03c0f9d2210
font_03_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 7936 bytes
SHA-256: 9bcf7892cf6b433245b5351a8f89e4617d95a4c0aad962efc2ee87de2cde021b

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