Malicious PDF — malware analysis report

Static analysis result for SHA-256 1153a2d117edbcaf…

MALICIOUS

PDF

68.1 KB Created: 2021-09-16 05:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e020f655f813608a7d62f6fd9af7f2ed SHA-1: 2918799b495811416a0eae354042c75e8e804e3e SHA-256: 1153a2d117edbcaff83cbe9f67a06f57785b93b5d2355ad3bc3a4ea0d05817fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojanized document. It contains numerous embedded URLs, with one prominent URL pointing to a download for 'coin master for android', suggesting a lure to trick users into downloading potentially unwanted or malicious software. The PDF structure and embedded links are indicative of a link farm used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=coin+master+download+for+android PDF link annotation
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fvhqshd8l54ggkj787j3hhmsli/4146969529.pdfIn PDF document text
    • http://soc-in.com/data/media/files/nudilat.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210909_23_21_16.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/sotijux.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210915_215644.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/59436576822.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/44177774215.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/7330599985.pdfIn PDF document text
    • http://zenkatsu.dk/files/gewubelibipi.pdfIn PDF document text
    • https://podimercrm.com/img/files/16282209236.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/fapimusiwogus.pdfIn PDF document text
    • http://weingut-suppan.at/files/zodoliridid.pdfIn PDF document text
    • https://taperagi.com/contents/files/93287160169.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/8915786000.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ecffb0a376cc49d5404f3f6a3aa5efb9/69973127613.pdfIn PDF document text
    • http://abwrva.com/uploads/files/gavivonivadukubuguzorug.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/63546027391.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/78739128848.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/1209955247.pdfIn PDF document text
    • https://energooptima.hu/upload/File/lutagepegogubidafe.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/42589668938.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/bamawolokodukipuzezip.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_off0000aeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FF 14268 bytes
SHA-256: 69944a7cd76b3c959394e961f4fa75b63956122f54d59869a22743b38f9d1ebc
font_02_sfnt_off0000ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 10632 bytes
SHA-256: 78d7ef0afe6683feb057f181aa74e4f14dbf434734fc8c5ffdbb2e479532ce09

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