Malicious PDF — malware analysis report

Static analysis result for SHA-256 4910c06785a8a3f9…

MALICIOUS

PDF

87.1 KB Created: 2021-09-13 19:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe750ad6ee126b66562ec65dbfe81f85 SHA-1: bf4aa46cc044f7ea879d78a3ea3b5b201a2abea7 SHA-256: 4910c06785a8a3f988567d3e72963ec9ead555906b97ad36c974f7ee5e8d12fb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coluer.ir/documents/file/24022795920.pdf In PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/rufidijugulaxawesagapopip.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/75197903652.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210903_5CFDC055FEAA06AA.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/pesulironuzemi.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/4548989467.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c974ae9df1---84539027442.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398589b5fcc---90836409498.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/46311175178.pdfIn PDF document text
    • http://espokebar.com/uploads/files/22907943703.pdfIn PDF document text
    • https://menu2uplus.com/images/file/jabob.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/46193854373.pdfIn PDF document text
    • http://195exim.com/datas/files/68469233908.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/37282816808.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/lowevenixifozol.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/mazadiwatofifomu.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/68770233249.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/64767044923.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/gesodaludumokevun.pdfIn PDF document text
    • http://jljemc.com/upload/files/60893428150.pdfIn PDF document text
    • http://ned.ru/uploads/files/25466406009.pdfIn PDF document text
    • http://holzweiss.at/45376895713.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/67935281880.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/davarizoki.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/palezibogabik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+call+announcer+app+for+androidPDF 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_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 17396 bytes
SHA-256: 1e10f82cf867209cb050e0d80f357414b0e5c5db1e036b20fa2f36e92e2e5711
font_01_sfnt_off00011d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 10764 bytes
SHA-256: b8a1557d487694c48bc3d455ebdc385dbbbd133e92ec88558a18aebdb588d0ba
font_02_sfnt_off00013677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1