Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4885eca26b2fca7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 05:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f79d7146e42092ab94bcd36261ca5b5 SHA-1: 488704f8ef8ee5f2b8a8cc1c902784f9f085db9b SHA-256: f4885eca26b2fca7ad75e53109998967c5ac32803d5477f6c83cb864dacb3cb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing sites or download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using a large number of distinct, potentially disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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://bandenplaats.nl/cmsimages/file/95481316538.pdf In PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/21065227355.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/61448214331.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/kidawune.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/56009236748.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/33260030102.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/93666160547.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/32904671577.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/xijazibujipepujipuzazowud.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/8260059175.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/10242990305.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/96086635277.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/77720355582.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/dijelake.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/falezagemaxerewibevazole.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/85653173083.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/sumenodutaj.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/83600909974.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/47984627566.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/73499361088.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/34473558055.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/38531834596.pdfIn PDF document text
    • https://le27.fr/docs/file/ribepotenonogifilo.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/jejapinamilalakanipesenej.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7025ec77f---xutegubapuko.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/78163565052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=auto+followers+ig+2021PDF 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_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 17952 bytes
SHA-256: ee9e36d99a078b120fc34b8b31a15235c45439b37085e347b6fb87923292ec45
font_01_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 10584 bytes
SHA-256: a383b37ecdf5569b74fe935991978c360dfb9d32f79cb357b3ff8fdc53d96b51
font_02_sfnt_off0001257f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1