Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64cb85e0cedc48f…

MALICIOUS

PDF

87.0 KB Created: 2021-09-21 07:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55d3d61cbbc16ef7a44b02ea934a8f28 SHA-1: a995b590c4608bb984c85e4294eeb49be90fe64d SHA-256: c64cb85e0cedc48fcda03b35e264c3426873a8df2d8b1ae9e9bb4eb7d3bb2ecf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external domains, suggesting it's used to distribute phishing content or further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights its nature as a link farm on disposable hosting, reinforcing the phishing/malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://philabc.ru/uplcv?utm_term=mac+pro+kernel+panic PDF link annotation
    • https://contact-house.com/fckeditor/upload/file/34762014384.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/21899546833.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6f6b2c1fbe032867e6b1c43203c3474d/70931611701.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/67057322252.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/78147868166.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/vukuxefiraw.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/jafuk.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/8649805328.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/393afe698c3f63914d8d895762df1c7d/toxipaniviva.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/tadiji.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/mixazenafulurabitavose.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/92488461624.pdfIn PDF document text
    • https://rajaunited.com/contents/files/piwik.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/50965807644.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/84486073261.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/tugilakejokikejofijiw.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/54198998303.pdfIn PDF document text
    • https://superchills.com/userfiles/file/judog.pdfIn PDF document text
    • https://vpmemorial.net/images/file/burepujaxe.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/zovevewosetuxumuloju.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/8099731257.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/gepikavibusekabemelokuzur.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/dotigafibe.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_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 18116 bytes
SHA-256: 826847f3928cbb723d4a6268ab0273f0597379727d500231e34a531aee3d78e5
font_01_sfnt_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 10184 bytes
SHA-256: 981c2927bfe21609f327f8744f0383cb26fedde29ba829818a681f8e71b2914f
font_02_sfnt_off0001367e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1