Malicious PDF — malware analysis report

Static analysis result for SHA-256 9874f023cd6ec116…

MALICIOUS

PDF

98.9 KB Created: 2021-02-10 19:33:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ec1b7d549e0a859bd72c78473d24ca14 SHA-1: d56e18295e937eead6c64e445a906a09b1f427c5 SHA-256: 9874f023cd6ec116b35f1bea4ec6df944fed01e0427f8739a13d6415914a18da
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'attendance management program manual'. The presence of a link farm and the ClamAV detection further support a malicious classification. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious infrastructure.

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
  • 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://yafferge.ru/aws?utm_term=attendance+management+program+manual+espa%25C3%25B1ol In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5fd27c07c0f9d.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/solirasidagume.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/losarejogen-kulixe-leruj-nobutuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_6023f00542808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496592/normal_6022e735023a2.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/VNidaid/naxugotikolufolopepupexig.pdfIn PDF document text
    • https://cdn.sqhk.co/tasiteregixo/ihyO9he/flying_arrow_phone_game.pdfIn PDF document text
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/bidutebuwuse.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/patilawasu/posiwozam.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/haemolytic_anemia.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/57055687171.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/xopiregiruviva.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/gosoluzekavebapirore.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/gift_a_mask_face_sheet_mask_book.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_off000144f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F7 5596 bytes
SHA-256: e8fd7aebfc909b8387ffe273f440930eda67b63b9f69d15f297c2b9bd4cea3c1
font_01_sfnt_off0001579f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579F 10664 bytes
SHA-256: 2541ac8acaa5b1b0aaea003edd1b203758c302a6271d12490a0df528cdf4489b

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