Malicious PDF — malware analysis report

Static analysis result for SHA-256 520b1a06df9a82f5…

MALICIOUS

PDF

119.5 KB Created: 2021-03-16 22:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 788e39f736d74a1d12eb69a2a7b99d20 SHA-1: 280e8495bcc540c184276133de292192a27bb0fe SHA-256: 520b1a06df9a82f538df4549003f832d346a1c435ea7cec899279f29a14a6f80
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious redirector, specifically designed for phishing or malware distribution. The embedded link `https://crophysi.ru/strik?utm_term=670+vs+675+roomba` is flagged as malicious and part of an SEO redirector lure. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly suggest an attempt to exploit users via a malicious link, aligning with spearphishing tactics.

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=670+vs+675+roomba In PDF document text
    • http://kamefutebiwef.mywebcommunity.org/horus_heresy_novels_siege_of_terra.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/stephen_king_it_movie_trailer_1990.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444356/normal_5fdd920571d5b.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/16835205340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502188/normal_5ffbdf6ed83ea.pdfIn PDF document text
    • http://tranquils.space/domidulebafiruwzuovg.pdfIn PDF document text
    • http://mon-cmso.best/jepadagikopenorb90u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456378/normal_60315ec0c9b87.pdfIn PDF document text
    • http://meetsalle.xyz/vurogegake059sn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_600b74e9e54ee.pdfIn PDF document text
    • http://zumbayuliya.online/the_entertainer_sheet_music_beginnerwjzap.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/62059360999.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/potamotaz/vitamix_immersion_blender_black_friday.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/how_to_program_genie_remote_to_sharp_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/wopakiwize.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/97014636996.pdfIn PDF document text
    • http://fotufawov.epizy.com/32227549551.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/a_first_course_in_differential_equations_with_modeling_applications_11e_11th_edition.pdfIn PDF document text
    • http://sazojojuw.rf.gd/13723869989.pdfIn PDF document text
    • http://bufalirafuma.epizy.com/how_do_you_alphabetize_excel_spreadsheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D29 5404 bytes
SHA-256: fa46ae33aa9217b39e81baa826bc54ec9b98e47f7e94e8b662668bf96390c115
font_01_sfnt_off00019f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F73 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0001a801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A801 11348 bytes
SHA-256: f80c025fcd5ca0773772cdaed2a0c39c59aee9bd9c09a4f3fd3b52e475f312d0

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