Malicious PDF — malware analysis report

Static analysis result for SHA-256 15152829da7d431f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 03:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c3ebd82fe166ccd51772451e41014db8 SHA-1: 902402958fe2e93728223f313bd75b264397d0ab SHA-256: 15152829da7d431ff0bd39f26d9df553ce77c2c8b6707d09e023272c8243bf37
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to obscure the true destination, likely to host malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chipublichouse.com/ckfinder/userfiles/files/zumejataropaxomupezabupud.pdf In PDF document text
    • https://marljivo.hr/UserFiles/files/nepegozupon.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/18319838029.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e16b69d9---12305415707.pdfIn PDF document text
    • http://sunway.me/uploads/file/10115259349.pdfIn PDF document text
    • http://labradory.pl/file/dujeb.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/43718856557.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/guxure.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/24115480850.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/dubuxurubitu.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/29913245658.pdfIn PDF document text
    • http://reylab.com/userfiles/file/2442752159.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/bixezivuwavinoraduwujafo.pdfIn PDF document text
    • https://mattress-leader.com/media/54109017783.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/16499917014.pdfIn PDF document text
    • http://x-mobio.com/upload/files/supiriditutifu.pdfIn PDF document text
    • https://fototipia.hu/files/files/joweda.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/62437763611.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140802996091---xesajanirezulesavamo.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210904235457.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/tesulepedemujisaxatusuzop.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/vevolanefozi.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/65184948235.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/feguz.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/kapepumufutiwomudig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=movie+bank+apk+downloadPDF 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_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 10396 bytes
SHA-256: 7c9318af8d7beb126d9614ba9122a91e90e650c5e2ea35756f6b4e217d9fe9eb
font_01_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 17960 bytes
SHA-256: 489347a9040a7512ec5c6e7edc23e4c8703d0ce65e67b097da818390306d584e
font_02_sfnt_off0001212c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1