Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ea2900e9d007a2…

MALICIOUS

PDF

84.8 KB Created: 2021-10-07 22:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 124a9be2a2285274a72fce172c69f7bc SHA-1: 1ff043008349ef11c7a1ca23877af3beac73971e SHA-256: 54ea2900e9d007a26e823a3a7f1e8ed7701c31bd6158e99c382f0d228c3d5531
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://originalcheck.it/public/img_admin/file///wumupudesexogowulu.pdf In PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/7988479814.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/16103210251.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/pilebekomole.pdfIn PDF document text
    • https://tessuno.com/upload/files/6153315b1b7c9.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/rinoxidexoju.pdfIn PDF document text
    • https://plasy.com/uploads/file/miluwerexejipune.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/degaboxukivibadeta.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/49650471612.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/16659728750.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/wesefuxumodufuwovagakamax.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/kisubomosamanerag.pdfIn PDF document text
    • http://www.agot.pl/upload/file/lejateromiwojuxokor.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/sedakivulug.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/21091207051218984584rtof.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/binop.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/bovavinuvorejigoja.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161598d84ada30---fenomezipozedewavubumawe.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/26138948853.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/81399700850.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/pikafopuzeludujipokuke.pdfIn PDF document text
    • https://network-italia.com/file/jepoku.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/14003708579.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/xabovus.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144756c9ff07---30037387772.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/45120402264.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/52110737987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+maker%27s+eye+revising+your+own+manuscriptsPDF 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_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 11232 bytes
SHA-256: 621eb08965433d9883be48310b0073d517d5a3557ca0f2b7d2979b6578781340
font_01_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 20016 bytes
SHA-256: 236634d1218a994afceb880eddafcdac0df3f9f7768ef504c687f92ed66a9bb3
font_02_sfnt_off00012d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1