Malicious PDF — malware analysis report

Static analysis result for SHA-256 24650b7a6fdaae8e…

MALICIOUS

PDF

63.6 KB Created: 2020-12-24 07:14:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ad037c0d12e73bfd916c9d7297d4201d SHA-1: 9bffa3b5dae31a9f72308194c29c79b25fc5d783 SHA-256: 24650b7a6fdaae8e08efa98875da6bdf9df0ea60e5e4d4948000f84df1a405da
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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.
  • 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://gettraff.ru/aws?utm_term=avatar+3d+vr+movie In PDF document text
    • https://pabotori.weebly.com/uploads/1/3/1/0/131070723/donisadem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5f99248a6a58c.pdfIn PDF document text
    • https://bokixewabukogu.weebly.com/uploads/1/3/4/3/134341992/widelawebofomumijes.pdfIn PDF document text
    • https://gumelajijepepa.weebly.com/uploads/1/3/4/6/134639918/wepetulap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_5fa19250c2678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f8f444746234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413346/normal_5f9cadd04c588.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/xonaxevetaf/bejeweled_game_free_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8fb2ae-eda1-409d-bb6b-d1ce4ed67d3f/65928120381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de600bbe-b06e-4ec3-bb29-772ec7874a08/11720679117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec9d2a6-5e3f-4612-8087-9d3c38841aee/pabilofemipudanoduzetu.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_off0000b00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00B 4976 bytes
SHA-256: 75b8b9ffc414a4fd050a1ec4fc75ad1b9b6e19d608d2b668bc005c1c228f3301
font_01_sfnt_off0000c0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E0 3940 bytes
SHA-256: 2092d174cc2bef6b6a327dfb40e22eb60944abaf8c8379bb4b2d48b9f7921af8
font_02_sfnt_off0000cf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF91 9968 bytes
SHA-256: bc0b1d14de6719145071d81b351985d1273356bbf82685236ddaa9bc908f694b

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