Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c9fcd2b6ae9f8c…

MALICIOUS

PDF

68.0 KB Created: 2021-09-26 07:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0952a414a05168bfb817289dffd17587 SHA-1: c7e5574b20223c00a8abf416e88c0d3d56c8025c SHA-256: 18c9fcd2b6ae9f8c255ee48d0fc030acc65f7edac1a13ac043473951d90b4c4e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates it uses an image to hide a clickable action, likely directing users to one of the numerous embedded URLs. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://garglob.ru/uplcv?utm_term=legend+of+zelda+oracle+of+ages PDF link annotation
    • https://cheesykeju.com/contents/files/nasiterudefufibebebaxe.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/nuzufanawuvupokexuvubiped.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/9279311527.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/97694269708.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/69210229601.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/92798254192.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/47940358037.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/70105687731.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/rexulupapanodib.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/13946650930.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/regage.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/tibaluvoxifawunutugod.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/9e237e9449a86a0415b7b199e521f33a/45839271563.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/47916340299.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/43267577602.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109031305155509.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/64678042092.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210924121740.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/78193110409.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/6048802474.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/86720413115.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/watufuvoxaluxipumukitakuf.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/14152631683.pdfIn PDF document text
    • http://yejida.com/userfiles/file/gefutogejut.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_off0000b093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AA 10476 bytes
SHA-256: f3ff061c5be40055bdf178517ce2542ad3e70e05ec148ae570e7d5c910035af6
font_02_sfnt_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 13664 bytes
SHA-256: 8199e61b8dbce142fa27872e008177e4ba253733456b980d2c17573395c0b93c