Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c00aa15a0ccd40c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 17:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85e6c1299c3afd30e70b650a49f62823 SHA-1: 0c11f129754f9a13608453c0952017b822893833 SHA-256: 1c00aa15a0ccd40c1b483696ccd10ef45ae7b56412f1698cd4737d85c7c05e15
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or credential harvesting, by directing users to potentially malicious websites. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=hotmail+com+sign+in+outlook PDF link annotation
    • http://mercuresamuichaweng.com/admin/file/84997034419.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/rabatasulokila.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/vexej.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/ruredaziv.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/93641208264.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/37033896256.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/zusupimalojofa.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/58969911815.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/41202567778.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/28526429466.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/55292189298.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/gawaxenulavuvokul.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/vinulotofitoj.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/vapexozi.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/bf61f9b103942b0293f4c33e05694b21/76012405002.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/soxirupaz.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/11384914009.pdfIn PDF document text
    • http://allier-genealogie.org/File:/dotuwigapur.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/13357109891.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/20499320350.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/38522518636.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/32507857661.pdfIn PDF document text
    • http://rayer.cn/d/files/tuvanafakatebenu.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/makepuxewoserelod.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/26687657415.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/37705587565.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_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 10524 bytes
SHA-256: c136d48ae5491c3b5cd01de93b9557343e245a281b226d4112ab387a27dcf770
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 18228 bytes
SHA-256: e2a6bc2b53ad72f5a55e341f575cb3d21d9cdf2d6690d94667f8aa67403b2e82
font_02_sfnt_off0001265c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1