Malicious PDF — malware analysis report

Static analysis result for SHA-256 3041a92f36617368…

MALICIOUS

PDF

75.1 KB Created: 2021-09-21 02:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0e18d5b44c170089d5ac507c740facd6 SHA-1: 037a70e8a7301f8d06bbd21a9eb9f73ed213f057 SHA-256: 3041a92f36617368985fbe68cd97579c4bb86f6b9b1f38a035ea7ec3c4ce39c9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF files, suggesting a distribution mechanism for phishing or malware. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://abwingstop.com/uploads/files/298833995.pdf In PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/ruwuravanekosenigakuzij.pdfIn PDF document text
    • http://mousike.it/img_ins/files/purulujaxogaror.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/zemilutomuribegogunamod.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/poretinapojetiwe.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/nopowonimagoxom.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/72288817501.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/72833795434.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/87562595509.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/13040264510.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/93042654897.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/85297811035.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/27344141258.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/komadijexaxogizituj.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/90771695562.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/fovasagiserimeboses.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/91656366009.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/kajogedifutamiberexokubup.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/48204982867.pdfIn PDF document text
    • http://klemanpince.hu/files/file/vozibavisazof.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/modaxoxidivumafimelipin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hoga+toga+language+translationPDF 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_off0000c3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFA 10376 bytes
SHA-256: 1663238575ef37edd21e59b10d89025dc4dd9e5564c1924888ae5989c26ae65f
font_02_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 17016 bytes
SHA-256: 26dffa3bd03a49633ec15a4f6c032bf08c0bc905a392bf5390043d9397c64e56

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