Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2cc3fc95f029bc1…

MALICIOUS

PDF

92.4 KB Created: 2021-10-08 11:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c286afc0348ae8f4e7fa419c8fb4b1e SHA-1: 453dfe3176ace141acfbc09918aa56bdd924f6c5 SHA-256: e2cc3fc95f029bc1f2cd3d5bdea20e43faa837d3b213641f5f4b3597b4b30cbf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely downloads a second-stage payload, as suggested by the presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, which points to a link farm designed to obscure the true destination. The primary IOC is the URL associated with the link farm, which is likely a staging point for the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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
  • 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 http://tokyosushilohaus.com/uploads/files/danosovinudorudozukowiw.pdf In PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/19202626175.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/9904947729.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/43248916714.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/12432939739.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/52305714610.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///vajolizu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a8a5b0754---98862647286.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/98787467740.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e32bf68adee0c944fb9d935b849d0979/79011765601.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/jetevo.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/59589536006.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/kejixudalu.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/75531494035.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/77238448751.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/21317223168.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210904_5E7BB0DF9C59B994.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/nivopikotezidajomi.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109071346226405.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/xumovogosag.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109031838293951.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/kobojap.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/fuvoko.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/seroragevovibozupez.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/wegegadozewoja.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/65169705364.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/58550862574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=f+stop+definition+photographyPDF 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_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 20016 bytes
SHA-256: 5d8a9d8348810504e3c1355b1d62fa1f07d624c4e95921c77d7e96ae57f1fd96
font_01_sfnt_off000132c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD9 10820 bytes
SHA-256: a4308b4319ca8b2cfaebdaea815067b0b4c38684e091c7395018010adf59af43