Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03e27a255ae5b69…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 05:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a9ff7b6b896809f8d050617c3e8b2c1 SHA-1: 55bde622543b8751974e930f282b6c686bcc0d40 SHA-256: b03e27a255ae5b6934459d719df13c0c241dbb0b1ced8aca2079c8943c4f36d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which are part of a link farm. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, while not directly executable without user interaction in this context, is a common component in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.haztartasigepszakuzlet.hu/pics/file/13012146207.pdf In PDF document text
    • https://luminex.pl/upload/file/jakefejik.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/4955719185.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/mapafumogilivejoje.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/forifugipedilaziduga.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/39686812606.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/zegoxexunojetivapawuwu.pdfIn PDF document text
    • http://geodez.com/pliki/file/rajijinoxobog.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/ranasonavixokenu.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/16153935718.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/siwasosud.pdfIn PDF document text
    • https://everestart.com/images/stories/file/51607875116.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/24842887705.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/vemabuzaxijuretutipazaf.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/68007693514.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/92444810900.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210912_4860668BB96FB2CF.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/noxapejekigevexupiwu.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/pigulejibejumadexuzop.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/xutividoguzewumu.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/tujojirixoporivumupanut.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ae6b417e7f49dd2cd6dd82fafb85ab7d/27573294881.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/fusutirozugokurolufoduvu.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/32830017047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+fire+red+shiny+starter+codePDF 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_off0000e054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE054 10904 bytes
SHA-256: 6cd502f2e2e58eb0c20d19166b9008865886d7b8d17adaf2e9b64576c4bd67e4
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11186 16580 bytes
SHA-256: 89ffcc35f15cd87ae0fed911d07d97420897c999d8de527473ac38115dd1c582