Malicious PDF — malware analysis report

Static analysis result for SHA-256 960840e90f9602a4…

MALICIOUS

PDF

87.4 KB Created: 2021-09-08 13:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9210583316262b028766a41b7f0fc90b SHA-1: ae20ae265bfc8cfb346484155a1ff574b89e08b0 SHA-256: 960840e90f9602a4da937728adf740c6a8d5cc5b4207849ae460e4af47a4b7bb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead the user to a malicious site via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://azseal.net/uploads/userfiles/file/41139292369.pdf In PDF document text
    • http://roland-toys.eu/userfiles/file/6187553418.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/kemixuzonikatipi.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/63621754642.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/51496302353.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/tipex.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/zeguzijivujagozorup.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/nititititam.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/wKmuRZfgQlBW.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/najokarozuxafozaxefu.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/98240542835.pdfIn PDF document text
    • https://badoza.net/userfiles/file/68276613303.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/1690013793.pdfIn PDF document text
    • https://steammining.com/userfiles/file/nafagagog.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/96556475248.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/51111347232.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/limugex.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/bidisezib.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/92094930360.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feab2084fa---74640808176.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/88298018546.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/piwojalasexaminurabad.pdfIn PDF document text
    • http://julianina.dk/upload/file/kifaxobagela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=faringe+y+laringe+pdfPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/72520895257.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_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 19732 bytes
SHA-256: b07f4ee95f42f35202ee47a5d38b25b861759914a0ad84e9a99e7cfea00c220a
font_02_sfnt_off00013741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13741 10380 bytes
SHA-256: bf9eb878378d52f685c3d85bebe8fdad5d4ba3b74f88bfe46698236491cf8506