Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbec69b9ff7ee7f…

MALICIOUS

PDF

69.4 KB Created: 2021-09-22 09:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 022d4a04a03040d03c5141ec1e81f15c SHA-1: 92ab5102524fc4fd9f03fed42318236e308ce85e SHA-256: 8dbec69b9ff7ee7f943c5fc66eeccea682f2f6e4877ff512e81c612c894986da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=subway+surf+game+mod PDF link annotation
    • http://lacasedescaraibes.fr/file/26093528512.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/7480548547.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/nugebeganaw.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/96202423188.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/91028638771.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/ruzozunutagoxabagilevu.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/55678763640.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/4417624416.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/gafijinikozezafukarixux.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/46938487431.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/notuzag.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/vedebinivoda.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143779db55ec---bomiloxanovibenixir.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/35145669842.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210916_60A9DF052DF451D8.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/wuluranidil.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/luzuvidod.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/bupedunapib.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/95393104438.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1bb8639f3---94455144697.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_off0000b097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB097 10872 bytes
SHA-256: c685445063090f5959e7558c94f0eff168709d8598dee31ff6827b9a3c4a8197
font_01_sfnt_off0000c99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 15200 bytes
SHA-256: 2d8bbcd83c001b70602ca0096b57414744e839b84bf89b9a81fe8d483b8924c5
font_02_sfnt_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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