Malicious PDF — malware analysis report

Static analysis result for SHA-256 7682e49ab168e8af…

MALICIOUS

PDF

67.6 KB Created: 2021-09-25 00:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 67570b05ce28923c7d4554d7a2cfe392 SHA-1: 0a95ade7db7082e61a0239a4ead23f6a732d802a SHA-256: 7682e49ab168e8af60bc9b68f6aa8e663f13fdd818b83bff085ffd0cb271f86e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded action trigger, typical of screenshot lures. It contains numerous links, including one pointing to 'cateringkieuan.com', which is likely part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://cateringkieuan.com/uploads/userfiles/file/funubipujugojunas.pdf In PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/16135236418.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/82435506673.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/93018349362.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/75010629800.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631142689sageruwugi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/67517044703.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/7421724134.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210920060116.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/47871282984.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/31820411499.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/37793207932.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/74494669327.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/58059316606.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/fewonavitelomowazu.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/48741037421.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/15815328494.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/fiwesowolerotevebul.pdfIn PDF document text
    • http://cellfruits.com/ckfinder/userfiles/files/vikirafosimumanis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+free+luluboxPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d49acf3af---tusaxo.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://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_off0000ae08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE08 10416 bytes
SHA-256: 71f9d93c0a78b0f40f344cdfb101f2b3ae82b2c30ce842414bd49b39cff7f18a
font_01_sfnt_off0000c5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C9 14048 bytes
SHA-256: a122447a675ce0632912e0d0027a7caa40bf5cfc504c13102c273098a769c230
font_02_sfnt_off0000e8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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