Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaac5a2591b13158…

MALICIOUS

PDF

83.7 KB Created: 2021-09-21 16:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b8bd06ecd88af63b40c1d12ad9f4b78 SHA-1: 10902d41e6c7c19c601a32dbc9e74c458fbb3cc8 SHA-256: eaac5a2591b1315871dba300f229cbeea0bdc6be4dbffc00daf346b923f7ff8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external URLs, one of which is a redirector with a 'free fire download' term, suggesting a lure for users to click and potentially download further malware or be phished. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=free+fire+download+low+mb+apk PDF link annotation
    • https://bikeid.net/ckfinder/userfiles/files/zaxuvajimif.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/db4f942849eb75bc86496ce44c9ea780/70133004966.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/kadidunotidurutovuputa.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/fegemi.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/sukofalelulisumo.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/93041188107.pdfIn PDF document text
    • https://onecre.com/images/content/files/19570560103.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/46813505394.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/purotovutonotinalog.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/lofuletiwogevajamu.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/67082221307.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/janod.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/14960270172.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b62f31bb8f---15801023247.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16308968429aa3827bba3afb7ff94a.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/kikabebubuwizud.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/ponabavibasarokarubewap.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/japux.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/tufelolinazuwufagitomurig.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/giliguwarolukoduj.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_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 10688 bytes
SHA-256: fb77930f690681873851751bb20a254deb9fd534e4b89ce46f782f218dc58168
font_01_sfnt_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 17588 bytes
SHA-256: 4879ce5a248005b6d14898f5366980d56dd4e93059ce65d2c0458376762c0ba9

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