Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c3f7a880cae9f5…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 04:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5122beb5cfe377d5267951bbb8ec8e2b SHA-1: 17ffb2946513f88440d3dd2b494f3dc1ea0f181a SHA-256: 48c3f7a880cae9f558a70ce0ec4e36039675125014af8ccfa13311a66af9b555
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites, which are probably used for phishing or to serve further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=impact+minecraft+hacks PDF link annotation
    • http://prime42.ru/userfiles/files/40190687221.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/24031529105.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/sifebuko.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/lozasapideri.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/32145397105.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/42284104220.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/worapexegijevugi.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/xawaniguxedijinezawad.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cd5b2f754---2883197903.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/43505157504.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/69807384864.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/86296569371.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/51463204544.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/foxorudiboziwabu.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/42252931902.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/menefa.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/gatovazisosi.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/begekerugogimidoseni.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/71627810227.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/42269612470.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/48943819729.pdfIn PDF document text
    • http://vladekoservis.ru/files/79514071229.pdfIn PDF document text
    • http://w-mill.jp/images/file/sogotiferoruwitaromami.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_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 17372 bytes
SHA-256: 020418ed3126affd7f2bdfe59e3570fb1a4c1c0da3e34897f5cf9093736e884f
font_01_sfnt_off00011937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11937 10624 bytes
SHA-256: e33d43bf2bfa117db52fb3ca8620575cff690c5e5a18e701ff4cf2d8e8104698
font_02_sfnt_off00013151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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