Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6030dd1da19b31…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 05:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae5cdd534ab611afd07cde50e3ac6422 SHA-1: 173a935c12f35ab9cf0f7cb606ca1999885f2137 SHA-256: dc6030dd1da19b31f6a0a93e82230f7fcaaa97f8d639c0827ae506870f19e196
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or link-farming scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://drafthe.ru/uplcv?utm_term=ocr+a+physics+formula+sheet PDF link annotation
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144d13f26ec6---tidikumafex.pdfIn PDF document text
    • http://northcity.rs/slike/files/95229849883.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/fokukugopapoxixi.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/webavevakasizina.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/rodotuwatunuruwapitiref.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/45471385867.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021091806483170554.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/ruwiladisi.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/15188843122.pdfIn PDF document text
    • http://gaudi.tw/upload/files/janoxetobipegelow.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-25/images/files/63019955087.pdfIn PDF document text
    • https://nls.vn/upload/files/63932576352.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/38387536864.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/49519519262.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/20299146326.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/zavukepekav.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161427cd130b1b---12268393134.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/wofaxaxapejozaxa.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/zewavaga.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/19633520042.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630906369.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/24573784397.pdfIn PDF document text
    • http://gibisch.biz/files/files/puzitikidawilokoza.pdfIn PDF document text
    • https://krishnacock.com/userfiles/file/puxidazujukorovot.pdfIn PDF document text
    • https://ycb.one/pro_pic/files/79166432210.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_off0000b1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 16296 bytes
SHA-256: 216298bf32de8dc8209a0a6aa4e2790609f761fc7d63921279c07a696a1fa3c2
font_02_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 10880 bytes
SHA-256: 3fdf480814086c01e61f92fca8812e4a40796e229013c336c04a0d6a9b625b10

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