Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0de2896aad8c0ea…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 19:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 460cc6bf2e0c429bb9d9258e5eefa225 SHA-1: bf1a4d52cb1dea4e77eb1aaa7d91869dbad939a5 SHA-256: d0de2896aad8c0ea11b8b4364d3250609ab63150ad433787c341d71e74d30ce4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URLs, many of which appear to be part of a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 https://huntic.ru/uplcv?utm_term=resume+sample+for+job+application+pdf+philippines PDF link annotation
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ac421ff0a74b19f3c25e4bc4491c9385/bijutowelas.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/wojokokubow.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/51974324638.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/mokebagefudevowawikevepaw.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-8/20210908000806860375.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/95145290834.pdfIn PDF document text
    • http://apsons.eu/files/file/54749648758.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/wunuroteteniwexaz.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/49320629446.pdfIn PDF document text
    • http://stl-hk.net/userfiles/96305136396.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/fipomidomijufa.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/zoxigalakebetenas.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/perulepojirafaroburavem.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/60990516291.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/58541126374.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/fepuze.pdfIn PDF document text
    • http://parentini.it/userfiles/files/kamelixujoxepotavukavafu.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109041748362012.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/fupolitezagi.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210908071319.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/rekidifiz.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/gojajumavinikalipezijut.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358a6b46924---95020395870.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/33787266253.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_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 17808 bytes
SHA-256: d55131c9e904a6a821c4fa407741264c987bd911fdde215ef9adb49a4cd7a172
font_02_sfnt_off00012a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A85 11300 bytes
SHA-256: c61fa31fe8a6a3d84967cc2e748767aefe4b110658bef858a6c24568b86a03f9