Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a447b6b753c4e9…

MALICIOUS

PDF

86.9 KB Created: 2021-09-21 12:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e35f5d62ec4d7f4d2e380a3a9753e151 SHA-1: 2312c7417f19af731892d1d765178bf551fecf9b SHA-256: d4a447b6b753c4e9ab4620b6c5d0da5a387be86e9c8bfa7bfd8aeb53baef19e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs that point to external domains, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies the document as a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=free+apple+gift+card+generator+2020 PDF link annotation
    • https://netpage.info/userfiles/file/48068366903.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/juvorasoregadexelipez.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/2402450799.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/pitovelotojewoxij.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/60625533316.pdfIn PDF document text
    • http://sbcnepal.com/images/file/65230969746.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/99641032144.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/retidujafenafebadipiwen.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/nofakuj.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/12897579572.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/rulopevukazikuwuri.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/83000463636.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/wajatu.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/volixeno.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161416338efea7---punurimoledifegugavif.pdfIn PDF document text
    • https://tarsiman.ee/files/file/dadamomigolu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376845ab042---19605203576.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/19135813212.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/55358895285.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/satiwilinimotedivesu.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/mapoxemaxojuvaforupeda.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/7375852558.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/24586305380.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_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 17752 bytes
SHA-256: 56cf6e99aa8abe9b77649c67a57e97d0c48042b247bb071cf01ee907454bac70
font_01_sfnt_off00011ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE6 10848 bytes
SHA-256: b445204d7fa390f528b1263fcf39f59ca44a8d804c343ab4d8e5b1234ff3198e
font_02_sfnt_off000135d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1