Malicious PDF — malware analysis report

Static analysis result for SHA-256 92dccc566770f886…

MALICIOUS

PDF

87.0 KB Created: 2021-09-16 15:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bc40a71cd6765f7ae3c081eab6c9cd67 SHA-1: e185fe27974bc7253bea2f6d68098857ebd98c67 SHA-256: 92dccc566770f8867a72afc2a966d5e1362d2695d54f99675ac20914a1245228
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the presence of many external URLs points to the document's role in redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/34afe17b46067a6205be0738f2c15ba0/susenoxapegudop.pdf In PDF document text
    • http://888chji.com/userfiles/files/2564649421.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/43249985335.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/kixoz.pdfIn PDF document text
    • http://oris-am.com/editor_up/11461053740.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210907_4A3DFCA7C6296065.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/gidasusesoxusonadifole.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/6993000648.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/ximomenavogipijodunibej.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/97003007296.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/90121074273.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/fujexowosarejanigufudep.pdfIn PDF document text
    • http://caramelitos.sk/files/54928744359.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/nanokede.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/feboru.pdfIn PDF document text
    • http://sofar-france.com/userfiles/file/5579682632.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/70463372963.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/fakuxi.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/joxenatagotetikanoweduxad.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/67198599616.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/71112808712.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/f5af8ac3racd22mj9ijh73rre4/zopedusunixosewo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/68158778933.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/76804673187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=a+song+of+ice+and+fire+book+2+pdfPDF 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_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 10984 bytes
SHA-256: 69f1b656f23038a19820bd216d46985e9fd7ed82836bae3d872af2f592aae40d
font_02_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 18216 bytes
SHA-256: f1daba98b4ac0fd634f5d82d566c0a2fe4a552703969ea2332a2080cdc97895f