Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d979ed63599bc9…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 14:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3de17650183a00574306aa906dde35a SHA-1: a2b4f3ff6281d314fcb7cdcf715fe01d551d9a58 SHA-256: c6d979ed63599bc93c69e17d726044a245b2fde6387ef92dfec8715dbd3cff6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://esrafisek.com/images_upload/files/82211298935.pdf In PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/48484494166.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/xosepowuwud.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f578b9ea01---javezomufipusufi.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/73854218142.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/mudodu.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/67364352402.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210911160609_ekbwg6.pdfIn PDF document text
    • http://canoeing.by/pics/files/11118902964.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/70353981382.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/xulegudezikowujux.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/wanekoloxiralixamijoro.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/3661583834.pdfIn PDF document text
    • https://soechi.id/userfiles/file/49886526824.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/sevogokakebobu.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/pepenaw.pdfIn PDF document text
    • http://ranczowdolinie.com/files/sapenudobovonuzuju.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/dogekutidipomot.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/28395199829.pdfIn PDF document text
    • https://alkoplast.rs/files/61365812681.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/wibojabonajaloma.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/97732168262.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614378a3f0714---vaparak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=t+test+relatedPDF 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_off0000d481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 18196 bytes
SHA-256: 87b5a36b529209a6d18c432302cd8a5ff1b322266e1751bc7faa7bc24ad5e851
font_02_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 9888 bytes
SHA-256: cb462f732bb807b40bc3ffc8b767c1102a0a4f3e61ae555f3bfcaaa6fc34a7bc

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