Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d488c8db772ad01…

MALICIOUS

PDF

67.7 KB Created: 2021-10-03 09:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d931689c812208b34849c6ba09b8591a SHA-1: a5f4b60a4c55427743affb21c2f63baf63dfd193 SHA-256: 8d488c8db772ad019b5509a5034743b8cae189acf28b53cb85157e9b5cff6b73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm with numerous external URLs, many of which are hosted on potentially disposable domains, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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.
  • 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://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f80b6ae106676a920196c20edd7755e6/53478089751.pdf In PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/62249829631.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/gexudiwibavirazim.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/gelemirugegidosasurire.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/96569809670.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/jelojajijewebomufe.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3e7f1abc1---norujobive.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/91521994651.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/2190137570.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/dawujusuxosu.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/runesanukuvaketovogiv.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/10/64880485557.pdfIn PDF document text
    • http://mutitar.com/user_img/files/491551404.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/lubewasodigokomowewa.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/lisofiwov.pdfIn PDF document text
    • http://onelove.cz/file/13234689279.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/takeviludajeku.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/19192694031.pdfIn PDF document text
    • http://bienbao.net/uploads/files/niluwatale.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/81171621796.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20211001041821.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210903_215629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dream+book+numbers+online+freePDF 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_off0000ac15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC427 14752 bytes
SHA-256: 9810e4ebc938f6e3334661fd290f884ef1bbaf36a3e3b3682358e3445128231d
font_02_sfnt_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 10612 bytes
SHA-256: 4218e360a20fa6eb3216c801362b10e4c31baf72914a0e639a967748179e7e24

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