Malicious PDF — malware analysis report

Static analysis result for SHA-256 246a908f14ba8ddf…

MALICIOUS

PDF

92.8 KB Created: 2021-09-17 23:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9bc22928456836304d52a59f91e4f01a SHA-1: b428a4f393bdd62f7682d1d5a9396f45a5087148 SHA-256: 246a908f14ba8ddf67d0df164dffa048cd2c10d16e38c8d1ebbdd5e51d43f1a4
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm and a lure for a password-protected archive, suggesting the document is designed to trick users into downloading a concealed payload. The embedded URLs, while numerous, do not strongly indicate a specific family, leading to an 'unknown family' classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://menuiserie-sainte-anne.fr/userfiles/file/32381338817.pdf In PDF document text
    • http://robwalker.net/fckupload/file/nidopezekapowijara.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/jubuge.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/83233617336.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/luvuzifatekutigejim.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/46867629353.pdfIn PDF document text
    • http://iscelenie.info/files/file/figagarapad.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/maravisefed.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/lawiwopufavoredax.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/4491871529.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/vegexaja.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/3875829859.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/merotegulajinemosifibu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ffb92d36f---lesameza.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/86561323229.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/7eb4ba5705928e424b567395037112ab/semoxok.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/81176380147.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/mikitufamigolakuvu.pdfIn PDF document text
    • http://arablift.net/userfiles/file/tijatevijiserojuros.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091307264873499.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/1519895659.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/wiwajogus.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/74601393002.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/sujadazagukete.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/maxokudi.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/wewiku.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/jusobomob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pdf+unlock+online+without+passwordPDF 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_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 18280 bytes
SHA-256: 210c2838e6a494a8715d9688f51c2bdcf53dcf76d86fe7462d524caca18d83a1
font_02_sfnt_off00014b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4C 10996 bytes
SHA-256: 5f2bef3e6c9d9a56e4361447854e82cf7ab8cb2605cf2816518ec393eb1d757d