Malicious PDF — malware analysis report

Static analysis result for SHA-256 9417911a4730c4de…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 08:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f466e1d93d1859ff4ed54e1fa756424a SHA-1: 3542e921597635ecc1b1e0938d9a18e955d28475 SHA-256: 9417911a4730c4deba0be91248a87db0c8afc70595fc0c410bae511a1507c94a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting and appear to form a link farm, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=how+do+i+make+an+sd+card+default+storage PDF link annotation
    • https://yocarbroker.com/upload/ckfinder/files/fozejivonapudawexulebeb.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/2767150362.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091523045773499.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/tujiguxozadozineforoforez.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/19d52c8b0060bb37de124a1c4f6370eb.pdfIn PDF document text
    • https://yasacompany.com/upload/files/22085126165.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/94507199022.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/01a797a71802201d1fcbf3de350a02bc/18442505298.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/zuzopobanuwenomokudo.pdfIn PDF document text
    • https://cartolmania.it/file/fenawinirunavuzoso.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/rifedaxiwafeguwoj.pdfIn PDF document text
    • http://sayarbobinaj.com/file/85349199502.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/76118947895.pdfIn PDF document text
    • http://reopen911.info/media/file/duziruwobuvosufa.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/jamikapezodi.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/94985026719.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/99753284415.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/vipixanupovitexafen.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/90326916779.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/73245892562.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/gisivazamuxaduvozezur.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3272ca13---60501213790.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/96479313938.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/zamukagotizurewoxa.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/56622649009.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/fenimub.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_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 11088 bytes
SHA-256: 882ce9008eb878aa79c278826b09fa096153d2fdc90571b30735df744ff9aca0
font_01_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 17232 bytes
SHA-256: 8cb0254672b28811c9afddca473ba7e7b124a56b6baa31169b43d7e7825de6f0