Malicious PDF — malware analysis report

Static analysis result for SHA-256 099c46ce8b372f03…

MALICIOUS

PDF

103.2 KB Created: 2021-09-12 01:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 010b0c54a85aa7ba3595163cc7b022da SHA-1: fdefd31bb3f5726bcbf79bfdae532b33eb04abbf SHA-256: 099c46ce8b372f0358edefe260b37b757748abb86850014a0fd826448ddfa1c7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and the presence of many external links suggest it is designed to lure users to external sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://concertwristband.com/resimler/files/mazesibob.pdf In PDF document text
    • http://yacpa.org/yacpafiles/file/penileguvesilu.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/73931130308.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/56459896469.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613329ad4c70d---banivudeduniv.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/15216757389.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/4637109185.pdfIn PDF document text
    • http://szpk.hu/_user/file/ralukexuz.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/pesixosatupajulifivib.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/59189557274.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/30301569125.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/65208963401.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/tovifikito.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/xuposeruvibisuzoso.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/zuxepijuzanin.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a52c083b70---45566051700.pdfIn PDF document text
    • http://didopack.com/files/48941456261.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/petusu.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/wufenafivevisoviwetuv.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/senofujajexelexit.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/xozoruzimebobobunulorab.pdfIn PDF document text
    • http://www.bandungmesin.com/file/33225727519.pdfIn PDF document text
    • http://hrudolf.com/userfiles/23174973589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cain+%26+abel+wifi+hackingPDF 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_off00012cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF0 9460 bytes
SHA-256: 99e91a7763c4fa07eb676782136ba683d0ecbdc14bf25d13092509dd7d4b0906
font_01_sfnt_off00014136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15948 20652 bytes
SHA-256: 2e8a6a2c360762b4cfa2290e6cabd647cb0da835da5bef6b2e811e4c63a54722