Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b52e3601cd69ea…

MALICIOUS

PDF

80.6 KB Created: 2021-03-21 12:02:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 135a42048a0285c8de63f6a13ac6c16e SHA-1: 20f3fd867bb47498d443b5b2bf44eea98bf5a11d SHA-256: 64b52e3601cd69eae47462f37a1dbb176564b73883dc897dfc6faabe465b6aa0
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/123?utm_term=dbt+worksheets+guilford+press'. This indicates the document's primary purpose is to redirect the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://yafferge.ru/123?utm_term=dbt+worksheets+guilford+press In PDF document text
    • https://cdn.sqhk.co/pusobatosip/nnihfjg/wezifuxej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5fc8b30759b3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418575/normal_602d0640496b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_5fe62136e4aee.pdfIn PDF document text
    • https://pegepujime.weebly.com/uploads/1/3/1/4/131453637/kaniwowunuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_5feaeb6a77a17.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/bifiijh/kukemajalumiwilubapumase.pdfIn PDF document text
    • https://rowigoto.weebly.com/uploads/1/3/0/8/130813427/rituparifodilu-fozutomawixo-jazumed-fibifow.pdfIn PDF document text
    • https://gawokani.weebly.com/uploads/1/3/5/9/135993895/fc620c87757ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_603b907551a81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://momejulalaguja.epizy.com/public_speaking_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/argumentative_paragraph_format.pdfIn PDF document text
    • http://bolumopip.rf.gd/metzengerstein_edgar_allan_poe_english.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/desbloquear_bootloader_samsung_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/57735573813.pdfIn PDF document text
    • http://guxasimedoki.epizy.com/9605705583.pdfIn PDF document text
    • http://vapewokadovusa.myartsonline.com/29674729534.pdfIn PDF document text
    • http://teropisarazo.myartsonline.com/30571514092.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/words_describing_moonbeam.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 5388 bytes
SHA-256: c75c94b44c6823d0f243a40ea61ed46979443557a7d28ecd64f26d16781589af
font_01_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 11852 bytes
SHA-256: 8887d8392b87b54d45837708ae88bcb64cb7c91668a82b6123a5a521fcfc754e
font_02_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d

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