Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b33b5b4739dbe4…

MALICIOUS

PDF

85.2 KB Created: 2021-09-23 12:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bbb7a84a02baa64eff31a5707db3a75 SHA-1: 1aadf492af50e3b9d86b2325cfee5bd8db199d2e SHA-256: 84b33b5b4739dbe4b06b774b17e5830e8b3c6967b77e487667e208f0144c1b78
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, characteristic of a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple disposable and potentially malicious domains suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pistant.ru/uplcv?utm_term=redmi+note+7+bd+price+2021 PDF link annotation
    • http://aasghsflqsae.handylover.com/upload/files/dafarixufofixigofa.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/mosoberurimipagevolan.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/kovatijo.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ed217ec46710cf6b65f3ab49552de9b8/12603622928.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/59898383093.pdfIn PDF document text
    • http://floramarble.com/uploads/73475994247.pdfIn PDF document text
    • https://aaaxxion.info/images/file/39169113567.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109080724291082.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/82914084955.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614720d111f08---71303758938.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/ziposanajer.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/rejoworebevarunumanuz.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/kezoxotagukebunolakidota.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/renevetu.pdfIn PDF document text
    • http://popeyebio.com/upload/files/korenenudatur.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/wovebapofujigodiwi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/37860300265.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/27167807462.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/76736158619.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/sufel.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/10865950741.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/63742427749.pdfIn PDF document text
    • https://mentormedya.com/files/57567445089.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/wiwixetovofebozukab.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_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 20676 bytes
SHA-256: db09c4c05003b1cd8e0ed673768fe927d4e8c2bd0f264eeaed66f0ff58e0702a
font_01_sfnt_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 10828 bytes
SHA-256: f199232fcaa4f33bbcc5d6d4503ad339103c7aaf212347582fc9a0d309b5f184
font_02_sfnt_off00012f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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