Malicious PDF — malware analysis report

Static analysis result for SHA-256 3827b65bc4d360b6…

MALICIOUS

PDF

67.7 KB Created: 2021-03-15 00:23:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dc66cf5e63a47140383b890271c453d1 SHA-1: bc6f40a2ede15f9ec3fe2b8fa262c068a1da2a84 SHA-256: 3827b65bc4d360b61b025702461ca9baccdf67136b0a6422a65629667ea46ce0
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, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

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://crophysi.ru/123?utm_term=assateague+island+va+surf+report PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492575/normal_5ffd3728202d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462096/normal_5feb1945760cb.pdfIn PDF document text
    • http://persequenteamsohbet.com/arranging_numbers_worksheets_for_grade_1z8h5t.pdfIn PDF document text
    • http://nikaold.site/90032303101liz7z.pdfIn PDF document text
    • https://cdn.sqhk.co/zugeketinog/f2aL2hd/easy_fried_cod_fish_recipes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5fef853b8160d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_6023e9ffec354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465396/normal_6028948e3a93f.pdfIn PDF document text
    • http://mishabelle.ru/solving_equations_with_fractions_worksheetqwffn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_600c97d1993ba.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/FG6hehi/sharpen_blades_near_me.pdfIn PDF document text
    • http://astrology-personal.online/what_do_you_write_in_your_godson_christening_cardv3p8v.pdfIn PDF document text
    • http://pubgucbayim.com/xafisodotipukavapafufoj2oybh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_116c27eff98343a7ad0d03176ad53658.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_14f98486735c4c6481b48c4b8aeda855.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_7f9db95761474bbdaf34db04755d3d58.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_05df8afda0ee4571a9c444586e48a025.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_off0000ccd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD3 5256 bytes
SHA-256: a15b9904c667ddf1de0abdb669390a0340096539fe9f888c0d8229b1ccc4fa51
font_01_sfnt_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 10216 bytes
SHA-256: 092fb30dbb07ac8d94d84a6ee8d9b3b6befedc8d07fadb697b21fce4200d0a8b

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