Malicious PDF — malware analysis report

Static analysis result for SHA-256 af99b7c12ec7da13…

MALICIOUS

PDF

85.5 KB Created: 2021-09-21 06:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a99960b35ecdb50a192f636db80993e SHA-1: 4f96c66c8dc40590e488b52538b5376e7ccd6669 SHA-256: af99b7c12ec7da135903a291d745437d40938037aeae0e7988c2bd6db984492c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests an attempt to execute code, likely to redirect the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://rougezenekar.hu/files/file/68032511753.pdf In PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/3ikq8m7bdibv56ktmtcq2s389e/nusavudowugopoxa.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091601464426.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/jiketox.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/90760227517.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/zivaru.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/pumumesakuruwifuvuvesiwu.pdfIn PDF document text
    • https://armenia4d.com/contents/files/tanotakalobepu.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/zefatavemi.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/nerus.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109060654001098.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/bepagoxoxagexevomaga.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zelilusuwimojeme.pdfIn PDF document text
    • http://umhouses.com/uploads/files/10490612823.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/94843487996.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/tarewosiwamumigemoraxele.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/10517094991.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/linez.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/37090314312.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/fuwutejefusekiduxibobek.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/xetidejobe.pdfIn PDF document text
    • http://kalikraft.com/images/file/48685655944.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/xurowegoxuwukujopaxi.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/72995261511.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/54833384925.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/notomuxisixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fps+in+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_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 10084 bytes
SHA-256: 0f9d87fe2426245677a6152d5d98112ba1cc56792984b0b887ba459b89b9a570
font_02_sfnt_off00011ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA4 17484 bytes
SHA-256: f8d67723ca99b7942f1a33d19a217588607687636c41cfad223488b1e28d6823