Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8c2a7ec7cb839b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 12:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30ca5d2325383c78d8aa06399203444b SHA-1: ab56b9abb3333aed55c4ebcd77721621df3ede9a SHA-256: fa8c2a7ec7cb839b6d48d66153092839857137fd9b3a599674bdbb80ec598f79
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a large number of external URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=pixel+gun+3d PDF link annotation
    • http://lynxauto.ru/userfiles/file/72756234004.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/59992990552.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/76358727673.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/farujivosutewopibapuxu.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/mojunilelenos.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/darotifuxe.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/demopidowu.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/57581893189.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/repatuvagoxotisema.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/sefulejupokujefa.pdfIn PDF document text
    • http://sbkf.org/files/files/7473494178.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/37144876706.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/75849107484.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/s3rt8ft1raubj5mu78sgitqja4/rokelerarikan.pdfIn PDF document text
    • http://e-sheremet.com/img/sajoxesefejifalakavaso.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/60938134517.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/18541335160.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353ec57db54---98116812990.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/xozole.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/ketudi.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/20826521808.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/22338466374.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/xilidokimo.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/32232003834.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_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 10152 bytes
SHA-256: 2439934d9a9d769d882e8225fd79d16c9efde8fbd2c76aed827c204f7ab1ef12
font_02_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 20260 bytes
SHA-256: b0af645d46310ff1d8f3932e1e007f58e0e90dbdef0267666e9cb22fd27b2def

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