Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3549900cfada9d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 22:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9dd5485ae67a4aa2c9b6bfce828a0f0f SHA-1: da246802fb519c0b0bc2b2ee537dc43faa7cf96b SHA-256: cb3549900cfada9d23f0133caed00c7063dd20aa6ae8e9256562de652ee35ad3
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by an ML classifier as malicious. It contains a large number of embedded URIs, many of which point to domains that appear to be part of a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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://appvid.eus/userfiles/files/18451691250.pdf In PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/11989104883.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/sejagavo.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/femufigisejugojulunoj.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/1901869903.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/xukasuzotu.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/wajizigajof.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/jatifipoti.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/81699611077.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/72237841961.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/88720083252.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/ramenivufusapiwoxa.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613865607db03---petifojelexola.pdfIn PDF document text
    • http://scarpatti.com/files/60601864240.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/kemad.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/nabisukidatuneke.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/3561028383.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/benofajoxekuf.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/54811713664.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/runixekugimabasuvi.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/91963733334.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/kokujezopoz.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/tusowopuxuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+can+i+flash+my+android+phonePDF 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_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 17768 bytes
SHA-256: 9fb20614089a33899a8e873ded4fa827be906e8c336e29aa93278986941c0e73
font_01_sfnt_off00011346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11346 10976 bytes
SHA-256: 05b0311526aec9a39ebf5433fdc54198f98593a321a60804f6d1bb3ff24c6863
font_02_sfnt_off00012c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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