Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b18128a2f29b28…

MALICIOUS

PDF

91.6 KB Created: 2021-09-17 23:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ba8955706cc352f399b5e1c7bee185c SHA-1: 7777bab8212bd33e245afd808b40c3170e1dc105 SHA-256: 75b18128a2f29b2885d7dfd91c676774345349749c19fa8fa7320fae90d7cdae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs and a heuristic indicating a link farm, suggesting it's designed to redirect users to malicious sites or download further payloads. The presence of a 'download button' lure reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=euro+truck+2+download+apk PDF link annotation
    • http://www.tiande-global.com/ckfinder/userfiles/files/81357881387.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/pasawobomopuridib.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/rawuvamewemosobav.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/zuxuribunukodabegodoxuwer.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/wixuregodoxizozidesop.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/28342271273.pdfIn PDF document text
    • http://healthywithhart.com/res/file/gufefafijawunewexaro.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/zudifemusagokidumununare.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93746856287.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141feb37cbb1---pobuxunitabedavuwuxisenal.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/wisalo.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109110401257596.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/navopaloze.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/maviriter.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/vopakitototaribiduriva.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/mivun.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rctqidnfkp36ki6mjs5ftnlvo6/xotiluvukutaralidapadevi.pdfIn PDF document text
    • http://unseretochter.com/images/file/65718497610.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/85703147690.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/72496420415.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/ziletip.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/72094669712.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/25244117447.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_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 18900 bytes
SHA-256: 15f03e57cc079f05d36c0bcce49f1803a07d9e8924aeb5c0d99690a84d3a9cb8
font_02_sfnt_off00014892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14892 10496 bytes
SHA-256: 9be386923dfe9fff3f8d8837d791e1c3ec8175b8f68a1674133d4540dd9e7f3f