Malicious PDF — malware analysis report

Static analysis result for SHA-256 98680980bf6c5ebe…

MALICIOUS

PDF

67.5 KB Created: 2021-09-26 02:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1947a79dc0cbafa80ab92334a4e71115 SHA-1: ae1c13aac70f081afade9366e789aaf959a0fde7 SHA-256: 98680980bf6c5ebef7a206e623c80f9df5123a3f52dff53dcee54922db02769d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by heuristics as an image-only document with an action trigger, typical of phishing lures. It redirects to external URLs, one of which is part of a link farm, suggesting an attempt to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allamericannursing.com/userfiles/file/rosugukifujo.pdf In PDF document text
    • http://precisao.org/files/files/59155703689.pdfIn PDF document text
    • http://hasyo.net/files/file/91031468180.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/mubesabawivoxi.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/lekozekagiromoxilal.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/rujevazedafob.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/90422371820.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/lorikagurolejegoke.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210909102226.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/18223492036.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/66992123466.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42920224783.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/wivesigewajokenotazazo.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/pazawizoxorabavilujilarul.pdfIn PDF document text
    • http://checopharma.com/upload/files/wujuzekanapan.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/31855441633.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/10031734588.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/87561631797.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/14345491672.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/fabej.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/wurujuratokexi.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/59273074822.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/11751302825.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/18392913564.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/8038656916.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/62857770404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ipad+pdf+pcPDF 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_off0000b090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB090 14072 bytes
SHA-256: 27ae4b84dab1b438d3ceac15138ea161e4fe49fa64a3447b569e532bb75d7e6e
font_01_sfnt_off0000d364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 9704 bytes
SHA-256: dd962c9dca97e08876021ba0a5e2e2b0e62df2c953f2c064542d727a8b87991b