Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15cd4c01ca41918…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 01:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef52944a4f58f0b3936a5d28ee4dbd49 SHA-1: 999eb09c7b3feacc3effeecf05feabc2210be31e SHA-256: c15cd4c01ca41918ddb462ee4ef000d0b809e6ae6082560fbde03ab825ff064e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious download attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs points towards an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=internet+speed+meter+apk+full PDF link annotation
    • https://portalbime.com/UploadedFiles/New/file/zodamabijemewukuf.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/xexawowiwurusasopaval.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/wipip.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16136423851aed---51646182558.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a6bab9fc9a25bea45efa2e6e139df3f8/jodilikoku.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/4622268415.pdfIn PDF document text
    • http://domario.ru/userfiles/file/jojepusojo.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/63384425322.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109160337124230.pdfIn PDF document text
    • http://change4best.ru/upload/file/pijuxofati.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/58738030774.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/resapinixamav.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/22027612317.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/tojap.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/mezek.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/namikoxagodugegajon.pdfIn PDF document text
    • https://cicimanis.com/contents/files/dinomom.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/vaxazelow.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/60487411878.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/20629523959.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/32537109499.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481596e6a5c---zidimup.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/bufupibisu.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/77033283286.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_off0000b268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB268 10592 bytes
SHA-256: 24cef9745280c4c2bf4b5e8cc2af3dbfa5559dc13228fe82b72bfb74d4928933
font_01_sfnt_off0000ca9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 15092 bytes
SHA-256: d85d4ecb6a11b7b80f88321302d00020418261275639c93e65cdfbc8223ec289