Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f08ca6e8dfdc6d…

MALICIOUS

PDF

75.7 KB Created: 2021-03-01 13:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 06e9717c31aadff12b298108da7900c8 SHA-1: d9009a708989c4efbbd9e887769eccbe81930242 SHA-256: 35f08ca6e8dfdc6da7334185d15f13495aee87135c9b81869a41eab032d47502
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic identified it as a link farm designed for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/strik?utm_term=samsung+32+inch+smart+tv+un32n5300afxza PDF link annotation
    • https://werakemil.weebly.com/uploads/1/3/5/9/135973214/fawosoxuzigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_600f18b372264.pdfIn PDF document text
    • http://lufawobakisi.22web.org/20809219215.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/1804371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463824/normal_6008fa3d9fff2.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/zones_of_regulation_poster.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_600b3f857e18f.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/how_do_i_change_my_mobi_thermometer_from_celsius_to_fahrenheit.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/3202043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425487/normal_5ff47c15113b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_60216c933eb7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/rosuri.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/rounding_hundred_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/cidade_verde_sounds_acoustic.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/road_trip_movie_cast_blind_girl.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_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 6104 bytes
SHA-256: 4b65ee6fa4869eba00e114e4335381976f3d0f7d7798a76b50884137f1e23688
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 11148 bytes
SHA-256: 90cd961e3013b4ce1b6885c2c4e560cf6382c7398c56a5916332cf25821fd2a2

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