Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04d356b30272a51…

MALICIOUS

PDF

70.8 KB Created: 2021-09-19 08:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 313b24d8b8d0634dc1e57f417aca4a33 SHA-1: e710d8938d1b28c878b2282ec17f59361d084cfc SHA-256: c04d356b30272a51dfcfcca2143d88cf2764300f4a438c1728ffc5bb41151c2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs suggest the document is designed to redirect users to a network of potentially malicious sites. Although no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://evrenmentese.com/upload/ckfinder/files/tarolanixevelufido.pdf In PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/3550260778.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/32554262675.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/pufejatibiduxiti.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/kidivemijavekedevudajamud.pdfIn PDF document text
    • http://klenderbio.com/upload/files/78553673552.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/17650981617.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/39494714724.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/97138284743.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/famowisipumilajeme.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/sipuwip.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/wifozibevadajiv.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/pidawagipizavalejofotajo.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/84998579166.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/papigifab.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/88930368009.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/nokazinojowizetezumuna.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9e58d0fa---dawimozizisedofozujijan.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/28878485070.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/87414213843.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210919034656.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/fusuxemutepubuzipukilugoj.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/vilomaledujibugametaxoki.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/97881306822.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/natubaxabodanu.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/juwekiwekawekojutogizemin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=redecor+game+hackPDF 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_off0000b577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD89 15944 bytes
SHA-256: bfcbaa36bdc2ab2415b237bd21221ee43995f6fc549af4827998e5c257a17c51
font_02_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 10444 bytes
SHA-256: 0d1e37474e2d35cbdf5ac040f791ff54423daebb4b3bf3b88a509adc1d9d9475