Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc0bad993669d92…

MALICIOUS

PDF

71.9 KB Created: 2021-09-29 07:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb0b8bdf6dae4428cb539a898b0e1953 SHA-1: c85ab503412f345a4da4a57ddbb3322b482afd00 SHA-256: 3cc0bad993669d92c9da65e017cf032dde15430499263305f4bb21039ec9eeae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the nature of the PDF and its embedded links strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://casms.org/atts/news-files/file/dubirurererofololotife.pdf In PDF document text
    • https://drosamahetta.com/userfiles/file/35369446342.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/3111004243.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/59854149037.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/subidufudi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/gejefig.pdfIn PDF document text
    • http://placc.info/up_image/josaripamunupogevuma.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/81502690896.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/dulinapif.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/91872063647.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/faxinonox.pdfIn PDF document text
    • http://juentai.com/userfiles/files/vozonoxinuzibo.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/40678160876.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/xerosuvuzovabit.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/burokurepapuzo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613810b55c2d2---poravokuge.pdfIn PDF document text
    • https://actorconseil.com/files/file/83913369333.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/29909918189.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/jedodoxirone.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/92187437231.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/varuvemapave.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/66053490101.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/titozevuzilo.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/75324122676.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/88290805500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=com+android+vending+apk+latestPDF 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_off0000b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 10924 bytes
SHA-256: 69167a0988ed570f2f133f2d926561cd98eca7c1aec4edec1c6e4a5ce9917701
font_01_sfnt_off0000cd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 17500 bytes
SHA-256: c82f1957cb462422f1d4099475070e16c7111ea080b2fe695a47dd4628f20ea5