Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf562d4b58d819fe…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 10:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59594061ae6ad7b76e2d29473eded616 SHA-1: ad5621465d946d805afb7c4d8ff679c8bc8f2223 SHA-256: bf562d4b58d819fed73baca20a48450980a715ec59cfd274691aa62f24199d4d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains and appear to be part of a link farm. This indicates the document is likely a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=fresco+from+the+villa+of+mysteries+painting PDF link annotation
    • http://ephtour.com/FileData/ckfinder/files/20210907_7CAC19979E8E3780.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/numasugofip.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/93544231174.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/menopoxelowus.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/demifopojos.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/60454522336.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b288a2f1---xitanudelefejujubigekati.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144415ab78dd---nuzemi.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/35007149137.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/zifigefix.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/73996282911.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/moxozukumeramomoziviso.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/lowegu.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/genezojijonofamidetulazu.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/22244057828.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/35161763463.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///jadowutipawo.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/mojopokutivisan.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/65567931323.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/feburuxadojaxami.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/fasesew.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/3398517952.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_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 17988 bytes
SHA-256: 64011e407ed94da77c3efadf5865231336baf1ec6c7338dde606ea9f6f92a113
font_02_sfnt_off00012874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 11084 bytes
SHA-256: 530b6dc667bf5cc3ffeba8380fc860ef42969d4e1f41176095d9b3448c0de620