Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b1ce0564bd76ed…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 06:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b01c7741e19f12d792736fe77ddbddb SHA-1: 39ced297377780d8d81784b426c25ed9e6d4d9d5 SHA-256: 10b1ce0564bd76ed7c85c4cc4ea351b47c06a72d5e0b32b0ed9298ab631528bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=bia+3+online+hack+without+survey PDF link annotation
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/24646148702.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/38594261453.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/jupudizomarosib.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/vagudabofikewugonewaluniw.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca1a53e44c---rolegol.pdfIn PDF document text
    • https://fobh.net/userfiles/files/22439538310.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/21189743387.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/7595064932.pdfIn PDF document text
    • http://safetruck.gr/images/file/dilijepafukefepeposigil.pdfIn PDF document text
    • http://henca.com/files/details/file/vuserumixasov.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/filifufejalijetokawixab.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/38992185893.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/26916907068.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/buzilogijak.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/guwape.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/mekelesa.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/lijisabepalefopesupamogu.pdfIn PDF document text
    • https://kildevangen.dk/files/19706221527.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/51554167010.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/1124647238.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/75336757176.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/44458291325.pdfIn PDF document text
    • https://asi-filter.pl/files/file/70780284102.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/41677515214.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/xetatisanasowi.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_off0000d7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 18792 bytes
SHA-256: 43b353811d288d4107837c52e765e942e9d5517e8c83e1c2be84669ec6275622
font_01_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 11012 bytes
SHA-256: 85ee1328ec53efcb662ead9f3effa7926d10220a93c026f5f379780cf1deaa50
font_02_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1