Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cf810b6e277247…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 19:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7b206cffed05aa3c0a9efaee3be19827 SHA-1: 7e23522171af90125ac805ab043851bd09ecd4b8 SHA-256: 41cf810b6e2772471f2def03025b6866642545bac2021735615658131b072e48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous external URIs pointing to potentially disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/90581680101.pdf In PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210913013558.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b84e784d2264ef296bdf409c2cc20b21/80155415661.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d40b86cf6b---46908914912.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/16885066802.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/20729473724.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/42774666658.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/navuma.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/25170365253.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/budirasipovasojaxoloze.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/puzopiwul.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/lakilov.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/19180419955.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/88815753452.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/7573233543.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/80892519582.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/36272530264.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/loweluzawujadobovimaw.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/87113138172.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/mixutexonujilolu.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/dugoxidonojozeg.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/wozifowisogefusiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=poner+una+cancion+de+tono+en+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 10248 bytes
SHA-256: 98907893214dfb591f8c232dee94871b7c5bdf4d90e750c407c596d664cf967f
font_02_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 19004 bytes
SHA-256: a16abccf1317707c0863f2c7c2f93bfe39bbc5815c9198d8e2660dfe44ddd174

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