Malicious PDF — malware analysis report

Static analysis result for SHA-256 81488684f495337d…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 07:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0bfdca33c2a6fbcc20deb945e9dddd3 SHA-1: b26ddb15b63f347e2ec489031333d89aae8b220e SHA-256: 81488684f495337d9646186401fa21f29d1fea9db67f17e593b6fd0cb0f92dc3
134 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports the phishing and malware distribution attack pattern.

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://garglob.ru/uplcv?utm_term=flash+custom+rom+using+odin PDF link annotation
    • http://backupcenters.com/userfiles/file/89754581056.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/71934761211.pdfIn PDF document text
    • https://braus.uz/images/shared/file/66215534441.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/mezejupaj.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/13358501082.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/baleroxonigiramixe.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/92942270800.pdfIn PDF document text
    • http://salespate.com/userfiles/file/86077145072.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/zejajasilavujulana.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/bijetuwukepanovi.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/bolovafa.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/dasugukugit.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/23936933854.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138058900182---72567766664.pdfIn PDF document text
    • https://funke.be/data/file/29234536770.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ffabdc5e---pesasivitixugovimagebexig.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/bisakuguvopaf.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/mapigebenumijamowesolume.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/84488668047.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/28280014244.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/54232410789.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_off0000b92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92D 16196 bytes
SHA-256: 3317a28e7f15d063a569582330e7f81a15f0651ddb3cd648d3dfd908f6161537
font_01_sfnt_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 10760 bytes
SHA-256: 66ac776e8c1d22436f430e792aae3c4aebc003f32238234bab38c80576db9708

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