Malicious PDF — malware analysis report

Static analysis result for SHA-256 f286c4b122afec36…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 07:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f8eb9081c7362913df58fb5cadd741b SHA-1: 436fcc40809b81dbb9426ad99863daab2fd3b881 SHA-256: f286c4b122afec3680a944c7df604ad576083c117662502f6b2b7696a48afb2d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate the presence of external URIs and a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=galaxy+tab+a+multiple+users PDF link annotation
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae6a87fb2---fejikofulusoguvitanij.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/xaganipemeletiwikapijoxa.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/35440543331.pdfIn PDF document text
    • http://sin-hua.org/userfiles/29241819457.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/xiwus.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/67543268658.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/56651236180.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/puxivenogadejelutivus.pdfIn PDF document text
    • http://geodez.com/pliki/file/7869760313.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/11194311425.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/71609338405.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/72923159559.pdfIn PDF document text
    • http://vln.nl/files/file/60385705826.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/77037468695.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/26862241040.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/kobojudomesaretarovulodu.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/puzofafulomajonatok.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/nesujivovelefegid.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ho776ojdonq00l6aarpnju4f53/gurefonusudowo.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/butaf.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/ralabema.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_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 19864 bytes
SHA-256: 65177f70ea59a9d47a3f8fb98a099f92d9987955a06bee20495e4f0f95ed466f
font_01_sfnt_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A81 10684 bytes
SHA-256: 069163ebef315b49710cb233e494e4d45d7df902f0781b12d12ba82d9ea115ef

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