Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e43ad987f8f1a06…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 13:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92404e3de093ab7df6eb7f2d5b7ef103 SHA-1: 11e9bd3ca538fad78c95b68e282f0a3eb88f4732 SHA-256: 3e43ad987f8f1a068dc7a8864e32ab0e45662cd4e67192e2b62fa6821a399bb7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and a 'download button' heuristic further supports the conclusion that this document is intended to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=how+to+manage+storage+on+android+tablet PDF link annotation
    • http://vitalbafitnessclub.eu/userfiles/files/xetibaperajuzixugarudu.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/98649385411.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/92574600821.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/dilobipobowimofitefafe.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/21168483260.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/vojipale.pdfIn PDF document text
    • http://kant21.com/userData/board/file/24618031502.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a143daa0c7---jifazovujemigugujazawudaf.pdfIn PDF document text
    • http://newmob.it/userfiles/files/63547368036.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210909193853.pdfIn PDF document text
    • http://cichanski.com/Upload/file/39849405996.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/jarogegugumu.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kelaguteg.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/bubumagapurif.pdfIn PDF document text
    • http://futboltotal.net/images/files/zipoxiwawesegasugalareza.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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 17640 bytes
SHA-256: a8c69bec6f965122fd30e19a3e1242a13279ccc6a2afb3e3964425575c7f46dc
font_02_sfnt_off00011be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE6 10808 bytes
SHA-256: 71a373e016e39705dfe780888456f31255eb61d1295492fbc92680af203a3640

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