Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aad8c50618af75b…

MALICIOUS

PDF

76.6 KB Created: 2021-09-10 02:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95c81ca68f5b783e1ac9a899bf288c57 SHA-1: c6ed74460d5fe931837ba40ce682fc7d6730acaf SHA-256: 1aad8c50618af75bfc01b625c340e94a566fc9dc84233da99e06931915ad78ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to unknown domains, suggesting it functions as a link farm. The presence of multiple distinct hosts and UTM parameters in some URLs indicates an attempt to obscure the final destination and potentially track user clicks, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://www.julietlandau.com/fckeditor/userfiles/file/8107006550.pdf In PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/49760967310.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/87549654506.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/52184322233.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/37283505658.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/55049561784.pdfIn PDF document text
    • http://wamer.org/userfiles/file/7862063091.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/limotonunuwufojugazapepo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613057ac6a6fd---pepevewadozorilozeri.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/43943010303.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/94297312138.pdfIn PDF document text
    • http://vo23.ru/upload/file/38571523901.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/wiwofigulozapofadisewopos.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/62247707434.pdfIn PDF document text
    • https://clinicscrm.com/img/files/duwagarumij.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/afb7cdb327452e6d7e0d300097f3b3b1/88883743449.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091004265670554.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/12701980680.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/32003012267.pdfIn PDF document text
    • http://etkenkalip.com/files/penuzukoxajewubeparo.pdfIn PDF document text
    • http://arsvet.ru/img/upload/95153725439.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/77748072460.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vajigesokozeb.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/ralefokolerelokimotekad.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/39859704572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+app+to+stream+mobile+gamesPDF 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_off0000c787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 17200 bytes
SHA-256: f82132bd40621616814ee319238f83cecf94f5778bf3d4c821553675e6664150
font_02_sfnt_off00010c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C68 10684 bytes
SHA-256: 7d689dce19c477f61d63cfa82fbf5c8423faff678dff22483a7d6921c7e2156b