Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ddd5290357fb82…

MALICIOUS

PDF

77.3 KB Created: 2021-09-08 23:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff796cf4754303e948129bb282966da0 SHA-1: ee67b4d8c3296b092401b5da3c43907f47289840 SHA-256: f3ddd5290357fb82b9ae8c81be0844e4598d06f639a77ef21b66b9aeb80c59cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files, indicating a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are intended to obscure the ultimate destination, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://khocabien.com/uploads/files/jutajufe.pdf In PDF document text
    • https://searchkar.com/ci/userfiles/files/vorubuga.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/vekagokivipozekutixiriv.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/nazepamokokomak.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd17bfa10---vodojutib.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/32390726923.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/45039484482.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/26755613582.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/nudodareg.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/44867624376.pdfIn PDF document text
    • http://kaies.net/upfiles/file/jusulupopa.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/gefudabelatipegi.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/93897506221.pdfIn PDF document text
    • http://schokofontaenen.de/idata/30253448598.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/jagok.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dunoxedeviv.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/xavorafelodon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=droid+transfer+companion+appPDF 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_off0000ca24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA24 10736 bytes
SHA-256: d20eecd1f4ca2063ac2b4ae82f6f04a219c6435fe1eb3a0a547aec825feb616f
font_01_sfnt_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 17328 bytes
SHA-256: 488501dc08c3ce431ba72dd61e79b385c29461ac1573f74bfc41d6a91b412781
font_02_sfnt_off00010fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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