Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea09c82d5dbc24e3…

MALICIOUS

PDF

70.4 KB Created: 2021-09-14 04:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57c5e3b1fe06489b8f77ec155cd64f56 SHA-1: d2fe614171a1e13d6879a8ffabc6cf8d6e6e75f4 SHA-256: ea09c82d5dbc24e343a8fece045644a3f62edc5cb3ce438443ca08dba843183d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rentcar888.com/uploads/files/202109020913405962.pdf In PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/woxig.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/13459536657.pdfIn PDF document text
    • https://unosms.us/userfiles/file/85098574900.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/givegazuzalunemaguna.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5777cf152---23966859946.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/59774448019.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/12611875506.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/11258310062.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/70190763825.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/27705433727.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/ximamufezanose.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210913152017_1491505948.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/53331175015.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/dusug.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/mibaguworejil.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/visozebijozuxule.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/pafowatet.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210904_225331.pdfIn PDF document text
    • https://ratodua.com/contents/files/fokidezavowezepubebigad.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/gulotigumasowuburojeneku.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/26845194591.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5bab8acfc---vuvoluwevajalozujivevemew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=old+browser+apkPDF 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_off0000b3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AB 16256 bytes
SHA-256: 4d3b5dde1093231ac4760bfb6310a897edb101d7eb1fc1cde1ec1831414ba8b6
font_01_sfnt_off0000dd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 10436 bytes
SHA-256: 99d32ff9087177593d4010f646ae5db1cac4e5edf2e7c82dedffa1a206b47859

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