Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca4d5fca9e90579…

MALICIOUS

PDF

73.9 KB Created: 2021-09-14 10:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 623c742fc1a092f53714b20a26429996 SHA-1: 11f9a338892951a4779ade6202348e39a3fc0b64 SHA-256: 0ca4d5fca9e905796fcfad8ec423375dd36bc03adda2dc66c4aec461a307831c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://metafelix.it/userfiles/files/77538030856.pdf In PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/13657267182.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/tabetenasazunorufa.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/viwewufipadu.pdfIn PDF document text
    • https://eternalbliss.net/file/31866819573.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/55966060228.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/16309386360.pdfIn PDF document text
    • https://etadelloro.it/images/file/vusuxegenevizezudiwegapeb.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/zeduzodura.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/gibuzebofifilixesizuje.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/jetifasixakufonoladexa.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/fikuxewidariduxedomi.pdfIn PDF document text
    • http://wych123.com/upload/files/27908317821.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4f28b7676ff869544863dbeb90d2b7a7/zurotamodoxore.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/muguluje.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/relokofuwen.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/5475916226.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/202199227505131.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/44091565504.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8dd98718---93033544196.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/didesanajovosovuxegerizor.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/60284455184.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/9052277968.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/vutoturogusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bus+simulator+ultimate+multiplayer+mod+apkPDF 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_off0000bb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1E 17468 bytes
SHA-256: 96adc8ac0f1266e1644ca78cdb7bf400e13a2f11489601c63b2b5c0fcd8de6ab
font_01_sfnt_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 10808 bytes
SHA-256: 0af85f52da04db1ed4a2b5c3d516750fc594e7519a537e0bfef71327ecf61d98
font_02_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1