Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cb95389682c196…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 12:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 34f01f19fa1ab11ca16348ffa142a55c SHA-1: acf6a2eb8feab2deef2304c8bcc3665378548782 SHA-256: 64cb95389682c196ddc9641a510b744ca46bbfb431065236721c946329cd524d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not a legitimate document but rather an attempt to manipulate search results or distribute further malicious content. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://thaymanhinhlaptop.com/userfiles/file/kaxalesakubi.pdf In PDF document text
    • http://stigstudiotecnico.it/userfiles/files/57256961442.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210902_7B1A5CE0DD66C8CC.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/gibuvabe.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/97406158795.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/20410908366.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210904123450016.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6ed62b59---soboramovutali.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/730892603.pdfIn PDF document text
    • https://ms2oke.com/contents/files/bujovufigoxon.pdfIn PDF document text
    • https://polaria.cz/images/file/8258631059.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/94786979673.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/tupozusosekiwowizexur.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/xaxumegomofafigo.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/bapuw.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/taxuxejilutesisewufi.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/pexuvedifirev.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/wowuke.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/domupobimoxedoduj.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/f4ip3da5hfhp4q2ha7umssdnp7/laruni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=frozen+2+full+movie+in+tamilyogiPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/posiwebugevesupi.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_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 17596 bytes
SHA-256: dfe305a594f2e14424876023e1e88448bca39ba914e49e4391864e209161dd15
font_01_sfnt_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF9 10824 bytes
SHA-256: c28b80fe6e1dd3ba8a57e4c60e914274d0fe283f69f90e42e83bf423a663c271

Open this report in the interactive analyzer, or submit your own file for analysis.