Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a23f1c68bdfdf3…

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 12:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 330bd455b48a9cba16ea46a4fbeb9f1b SHA-1: 5e52f58328d192ec0a7253f49cd372b22a34d60b SHA-256: d7a23f1c68bdfdf3b54cec9c9ee3f83314a5b735c4b68ea922f03597fcd6b8b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://molecult.metallo-tests.ch/sites/web/upload/files/tekapowina.pdf In PDF document text
    • http://andreaslasnik.com/data/files/27251145498.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/75340633133.pdfIn PDF document text
    • http://yjccnc.com/upload/files/fakufadan.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613870329b01b---tenetulirapewipumokabizit.pdfIn PDF document text
    • http://e-sportis.com/images/upload/36403329492.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/53415202948.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/50916393844.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/guvavonazemi.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/82593733330.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/makebofazup.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/weviratoj.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/78588578521.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/32888432872.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/33870191396.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/bijomapazizusiwajikumev.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a53148c7f1638befc09914ce2b0ac046/pujotopaxogeji.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/78518152047.pdfIn PDF document text
    • http://wohingltd.com/userfiles/76167247273.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65626538315.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/pozipifawumuselafojasitaj.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/28484571215.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/tuxugevifuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dc+legends+of+tomorrow+streamingPDF 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_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 10908 bytes
SHA-256: de3394f2f7f41be63d9301c0635a0fe17c4a2fdfac2df7b21f0d293599e204c2
font_01_sfnt_off0000fed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 18720 bytes
SHA-256: e9dba5cbbe6dd13ed0cb78f4114801b26446fb87e01f69ef2ebd2518da6e28b0
font_02_sfnt_off00012f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1