Malicious PDF — malware analysis report

Static analysis result for SHA-256 83563474673070a4…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 15:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9995148033767d47f4b5913d55094372 SHA-1: 44c7b5fa162337d7da8f47b4b07a2f6f0eb57029 SHA-256: 83563474673070a46bd4daac9627d6b25a2b61c156334de6d57f32c29dc88982
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript, suggesting it may execute malicious code. The document also features a high number of external URIs, many pointing to PDF files hosted on various domains, indicating a link farm likely used for phishing or distributing further malware. The primary attack pattern involves embedding JavaScript and directing users to a network of suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a35135994e---70935210976.pdf In PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/13979883463.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/99939264796.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109070209255736.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/43702606311.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/3916617749.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/nikerojubavoj.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/92107469840.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/77612022494.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/77091991294.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/lepebuzagunabefukuwokopid.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/59919795686.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132142ac9ac8---51487954501.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/85615153077.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/68803536722.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/13615213853.pdfIn PDF document text
    • https://andhimazhai.com/images/files/losakelisipulupukidasib.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/nupeluzoka.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/89400631492.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/93408163930.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/diput.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/15511682140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+browser+html5PDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 10692 bytes
SHA-256: ab88e2e50494bd567806971f49e398197c8db54058d54a8254752116b51333f9
font_01_sfnt_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 18024 bytes
SHA-256: f7095d90848652c614b392c0bebd662edd69ad756553bde8933835633cf1e9d9
font_02_sfnt_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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