Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc400793bf703b9…

MALICIOUS

PDF

71.5 KB Created: 2021-09-15 16:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 409ff066d6693945a69e78262af590b3 SHA-1: 22be62ca2ff4d3563687826007ea3e72c13b3c90 SHA-256: 0fc400793bf703b912d7c8cc561779ea6d6ae669486c73f5e52bc907e5bf063f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it uses a social engineering lure to trick users into installing a browser extension or update, a common method for malware delivery. The document contains numerous external URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or redirection infrastructure for delivering malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=versi+terbaik+higgs+domino PDF link annotation
    • https://callmarkinvestments.com/callmark/files/32649073361.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/59408808974.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021991250205215.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/63552803260.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/kejij.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/26335303533.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/telowese.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/kufenizusuwaviduvaxor.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/43802725928.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/9383080154.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/durakajinexomijulajumu.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32214922333.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/15222441130.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140135f3204c---7741316846.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///88504375105.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/gojomibenobazupexejuw.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/pinibitu.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/75125889481.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b4d6bda44---nizezuvawi.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/62874365696.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/61896555297.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/13148962427.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_off0000b634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB634 16024 bytes
SHA-256: f7d7b97c30b1736d00952e0c2248399e858bf0338ec95921177a987052474639
font_01_sfnt_off0000df55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 10848 bytes
SHA-256: b8d1812c5b43f3389183a994dbc92d267861e46da581307edf0cd115b51aab72
font_02_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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