Malicious PDF — malware analysis report

Static analysis result for SHA-256 0605ec576cdc45c4…

MALICIOUS

PDF

99.5 KB Created: 2021-10-06 05:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 69ad900b757c127513c4892f1927a5c2 SHA-1: a0ed7b317edb43653a6fc340fc4874dbc71532f1 SHA-256: 0605ec576cdc45c4438d5dfbb0f08eb4a9809e57d575666253526b783225d4e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://munnarinfo.in/userfiles/file/tawisufokulo.pdf In PDF document text
    • http://alvit-bk.ru/userfiles/file/58245511596.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/gafolorokilepurukowef.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/32182273942.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141126c1a5cb---wiruxirefobepikox.pdfIn PDF document text
    • http://355353.ru/userfiles/file/pixatowovepomopofavigesi.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/xeniwasoputikixin.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/78594644781.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/muwufiburov.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/jifepufezagekunamuluj.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/94157517413.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/kujetunomegejotunumoni.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/fosesesavedajisubewisikuv.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/22515466337.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/fivugaxiwizasomabujefusu.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/27042004486.pdfIn PDF document text
    • http://plise.org/userfiles/file/73492336609.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/munusakekavinevesedizopu.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/4a4707b2558bada8bc0a74c227b18011/16708732314.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/sorituzudawubepeti.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/67600089637.pdfIn PDF document text
    • http://ontozescentrum.hu/tmp/japigixatekazebipemidi.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/67898461045.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/29224465264.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5c53895cf---jatobavowajuxevenakosu.pdfIn PDF document text
    • https://asiahealth.standrewsdentalsurgeons.com/ckfinder/userfiles/files/1589512290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+wonder+loom+bracelets+with+your+fingersPDF 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_off00011844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11844 11444 bytes
SHA-256: 70aadae19c5ceecca0d18e711cc6751cfc8b11c1efb4e13b082bd2f8a13adfcc
font_01_sfnt_off000132e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E0 20312 bytes
SHA-256: ea698381fe58681ad2d820f27d15785c9042a627d19d964eff6001175de92ea6
font_02_sfnt_off000167db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1