Malicious PDF — malware analysis report

Static analysis result for SHA-256 908012fc40721689…

MALICIOUS

PDF

72.8 KB Created: 2021-09-27 13:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8262c3de8f3231b33551d425e3255677 SHA-1: 56a12b96dc9fc4bc75f807b3a2c2014e2a4bb244 SHA-256: 908012fc4072168909edebd503d467e9a316f2a4650207370eb113ef5aadeb2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript, though not directly visible in the DOC BODY, is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=resignation+withdrawal+acceptance+letter PDF link annotation
    • http://ubest.ru/images/file/nitagebemajilisozu.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109260817218682.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/pepifotosefufarof.pdfIn PDF document text
    • https://euchebnici.com/img/file/sageruzulezisi.pdfIn PDF document text
    • http://wwsm-us.com/files/file/96779327745.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/50278693821.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/takeniba.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/13472527455.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/15835808618.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/duriseguxegaji.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329b40e4964---91742030639.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/bomasux.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/rowogotewalexikugadazub.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/85260699137.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/sesoxawi.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/8086133197.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36772524018.pdfIn PDF document text
    • https://telenovella-bg.com/files/xuboganifijajafoxoriju.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/larogomag.pdfIn PDF document text
    • http://wwsm-us.com/files/file/30490011365.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1b12ad57e---99049113391.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/mazufuzu.pdfIn PDF document text
    • https://songhong.info/userfiles/file/53615242137.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_off0000b957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 16848 bytes
SHA-256: 8cf9af41c2dc808c225c17561e80572f59d200de05fc6ac5b43d64d23d7b27c3
font_02_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 10924 bytes
SHA-256: 50b02b0ff5d7b24ae0a98fcadbdf259560d50842d55afc42c8764adcc4863e93

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