Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dd8fef09a655db…

MALICIOUS

PDF

69.0 KB Created: 2021-09-10 21:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9cd1f6e2643b4dcb0fbec8047e2a5a1 SHA-1: a587b6deca4225b4a72ea1a1c3a2d947b77ae0d0 SHA-256: b0dd8fef09a655dbf87d40e46ad9a222383e3b282712b2b3de9e966151a71026
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by an ML classifier with high confidence. It functions as a link farm, containing numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct, potentially malicious, domains. While no scripts were extracted, the structure suggests an attempt to lure users to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://karatenarrewarren.com.au/ckfinder/userfiles/files/zuwage.pdf In PDF document text
    • https://angkalaris.com/contents/files/14763953937.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/totokitipupaxutedumenemof.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/kenefababalapegi.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/sumujupanuvenaraxireb.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/44552691261385ce8030e5.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130228c6eda4---92520844966.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/tilok.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/37724608902.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/23504753841.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/6206677998.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/n57d4a8lc1uv6qr5fihh65gs1m/14664386725.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/14180450896.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/gepupoke.pdfIn PDF document text
    • http://pk.mo/userfiles/file/26696550942.pdfIn PDF document text
    • http://grupophi.es/uploads/files/ribenono.pdfIn PDF document text
    • https://aildf.in/userfiles/file/jurevulufatakukewedi.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/vawewonon.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/zisigi.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/54288328548.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/59059245048.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/47850882292.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/makufixigurowa.pdfIn PDF document text
    • https://atavio.ru/files/file/54375435836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gta+5+mobile+versionPDF 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_off0000b235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB235 10648 bytes
SHA-256: 51be0c52ce1fb06e72819990e34aae1a41359be89bd2c92acf130094c8dae4ef
font_01_sfnt_off0000caad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAD 14420 bytes
SHA-256: cf7e690d57ade0905696493368f7a44c50076a6dc2b9245127ba348840a4c306
font_02_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1