Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55857ba54e04dd9…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 05:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e553217f5814134677413b59dec470c SHA-1: b720ef810567028d7085ab07029833cd5a7b702b SHA-256: f55857ba54e04dd96164023b260fe00c8a05cdfa8d9e4cb864becbcf5154da8d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document designed as a lure, a common tactic for phishing or malware distribution. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download or redirection to a malicious site via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://geloracinta.com/contents/files/zokuxer.pdf In PDF document text
    • https://serrechevalier-skifun.com/imagesfile/nigijalo.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614539a86d529---lujagagokejola.pdfIn PDF document text
    • https://mihalex.by/files/files/pavefumaj.pdfIn PDF document text
    • http://packturf.fr/files/7819767176.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/46870587933.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/35997134343.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/7402524154.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/kabazosadevumefolutomojor.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/90586045640.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136703c9ae18---dojiwigafa.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/79280475295.pdfIn PDF document text
    • https://temporar.mirceaseminee.ro/printuri-fi/files/tepaf.pdfIn PDF document text
    • https://windscrm.net/files/file/popupudesuxixox.pdfIn PDF document text
    • http://enricobarraco.com/files/pepejapudijepojumimam.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/1550193409.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/48860951132.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/jevudurisu.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/vapevo.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/wonofirotufezakit.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/40820886211.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132537303c7c---87165919054.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/nonifavuwovepopaga.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/xegujebasixabepir.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/zakedimemifovixel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=iphone+hotspot+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_off0000b426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB426 10396 bytes
SHA-256: e690c9e32278c62cb0982eb86dc7a107aa1d4aceaaffad0354425e17c9bb3ab4
font_01_sfnt_off0000cb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB99 14064 bytes
SHA-256: 3123b6e00c1f7cf46f7f19bb80957215084ff3d68ec4a434626e0eff3fa418c5
font_02_sfnt_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1