Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9146b4f98b0fefe…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 20:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 695400d6b7d9e19d69a8974286bc530d SHA-1: 7c6ed3c7a5cdc5d2c7030eeef2b2d90a734d71ab SHA-256: a9146b4f98b0fefe05e187ac1f94a4bd5e17d91b8c5311c7d2046b8b1a9916a9
206 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a browser extension installation lure and links to algorithmically generated URLs on disposable hosting. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. The embedded URLs likely serve as lures to download further malicious content or facilitate credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=how+to+disable+hardware+buttons+on+android PDF link annotation
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16140072603f62---90948898213.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/xumaxujoludejudutasunuxak.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/4416624998.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/97174566147.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/dawubuzipisunagatow.pdfIn PDF document text
    • http://gr-chem.com/upload/files/pevumajumojaserim.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/nolud.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/sibexuper.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/puburas.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/lamiwoma.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/63752413768.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/lodalag.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/87184005095.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/58325288342.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/gugazimax.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/repupipuro.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/xixelirakebalipakubaberu.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/wobukamifudinamifunozipes.pdfIn PDF document text
    • https://unosms.us/userfiles/file/17219944597.pdfIn PDF document text
    • https://12shio3.com/contents/files/wukedujasapodat.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/56951157034.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/lusakaramasanexudak.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648b967eea---52903165206.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/72093047738.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/baxefovaxewogavadapa.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_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 17752 bytes
SHA-256: ff7cc9e6d562cff11198e6b63167a9817a71f21ac4558400da40d8786679eb57
font_02_sfnt_off00012149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12149 10660 bytes
SHA-256: bf8c8c287a2a4db4265acba33c03af5c8986cf46aa74bec7b797d6dee7730904

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