Malicious PDF — malware analysis report

Static analysis result for SHA-256 35479e66e872d0a3…

MALICIOUS

PDF

91.2 KB Created: 2021-10-05 13:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8a4dc96c94673cfa4e5be02fdd8f3baf SHA-1: a97c99921e5c62f949081065586991033e2368ad SHA-256: 35479e66e872d0a369e9ba8c934af5f95080cf9b6c78f4b038ec31735504edf4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the sample's structure as a potential tactic for SEO manipulation or distributing malicious links. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.gullyracing.it/admin/ckfinder/userfiles/files/midofalasimebevasopujaven.pdf In PDF document text
    • https://elmawadah.com/userfiles/file/38646097813.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/44089066936.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/favabozuroligopitu.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/88845839947.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/62740497315.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614668bec6482---15195904673.pdfIn PDF document text
    • https://eliteprotectiveservices.net/ckfinder/userfiles/files/degefogimuxiv.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/37537082554.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/041444135476.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/gisufiritijod.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/86781913161.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/tikonixodavaz.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/25652150566.pdfIn PDF document text
    • http://hrudolf.com/userfiles/70446855329.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/zavanatapi.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/zomumopobupawarexipaso.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/wagetigilowula.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/vodiluxomorasewog.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/morupusefofukan.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/b99ductqgkaafo5g1kjv5etcpc/9541979252.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/limatena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+belko+experiment+parents+guidePDF link annotation
    • 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_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 19960 bytes
SHA-256: e8a9235c5a624524c3e3ed8d4aad37fcb7ff864eb76f54fe00f1aa1eea68514b
font_01_sfnt_off00012be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE9 11236 bytes
SHA-256: 5b8121af4fca61689b91cbdce758cfdff5232b0305c5e6501e7acf791b94bc4f
font_02_sfnt_off000145a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1