Malicious PDF — malware analysis report

Static analysis result for SHA-256 963dfb91362ad97e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 11:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f792ecc72ffa07fcd896db871420a667 SHA-1: 0e54be4e0fffe2d71ce770fb5e16438d60670624 SHA-256: 963dfb91362ad97e1f2a258efcbcebbc4fb8615e386b18e12e949a95441dd3a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The embedded JavaScript likely facilitates the redirection to malicious URLs, such as the one found in the document's metadata, which is designed to appear as a legitimate download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=tiger+arcade+emulator+android PDF link annotation
    • http://seoulsquare.com/userfiles/file/beferedizekowafepi.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/vekojafalokakivovudirude.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/kegumexaxezojume.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/sifujerodemifikunozuzes.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/11371869249.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/bamemiw.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/10322262963.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/27676223399.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/kupene.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/65559530487.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/xirewufiluzusaz.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/dodobaduvobofe.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/30313216217.pdfIn PDF document text
    • https://hiroyoung.com/data/files/doxuzudeb.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/73181058026.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090910512373499.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7ae39b19---91190418781.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/50358186461.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///72882330329.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/pupurazepoboliwidaxuzoseg.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/bolevivu.pdfIn PDF document text
    • https://equinox-e.com/upload/files/laxomufokekelelud.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/16918432932.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/89288170785.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_off0000d348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 17316 bytes
SHA-256: 1aeb163863d14f9b7b528b62c26dfe88ddeb153611d68f59c213245fe0539f22
font_01_sfnt_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 10608 bytes
SHA-256: 2fb4d01a813bb1abc57ee0370c8d715fe4674704a6d62e762f4152a7506f6cd7
font_02_sfnt_off00011806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1