Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59d48ebcc8e3f23…

MALICIOUS

PDF

161.0 KB Created: 2021-10-07 06:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: de07e308d8d1d2a22d71b59c0398b86d SHA-1: a751c66c70e0c24d739ff8ecdbfb5fe1bd3e08c7 SHA-256: e59d48ebcc8e3f23d98d448ec83e56b8ba0be7f39d6bf8d9dfcf6ea8a2681610
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are on disposable hosting and utilize UTM parameters, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://krisoc.ru/uplcv?utm_term=what+is+religion+pdf PDF link annotation
    • http://hifitness.hu/userfiles/file/51801009086.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/95044933977.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/woriliwowamonerezupake.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/22062355954.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/gewexawubivux.pdfIn PDF document text
    • http://cutskytools.com/d/files/80046773306.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/kotatopisevar.pdfIn PDF document text
    • http://d-innovation.com/upload/files/kimawevojunaf.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a66806133c---35732225824.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/rotepetejebekibivu.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/16330264150.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/lorasusanadagenufu.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/blp12tp2tb3itf86ghu3t081cb/fufekebosu.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021918199241908.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/37908745050.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/64294911437.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/302830873.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/dijugopidenupigilog.pdfIn PDF document text
    • https://adci.vn/data/upload/file/88390741782.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/86456122794.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/sowososogusumaw.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021919103265270.pdfIn PDF document text
    • https://mkontroll.hu/File/kaluzowoluv.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_off00020a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A5B 23468 bytes
SHA-256: f86c88546d5a67e979df8870cee643894b675726c4eeda402fa03f5344d00ea2
font_01_sfnt_off000245c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x245C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25DDE 10768 bytes
SHA-256: 281b35b83b77286c4558807a86ad29bab0ef38197e6fbe62ba5ed393790ffef7

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