Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce56be57cb0d121e…

MALICIOUS

PDF

72.9 KB Created: 2021-09-22 14:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef8f20386d85355b491e01f51561f795 SHA-1: d24c48fcbef41d373a64b431572684ce655ada38 SHA-256: ce56be57cb0d121e26fbb780c8727caa957fdc71738642168308f69fa682e9b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=community+health+nursing+textbook+pdf PDF link annotation
    • https://stoneappeal.in/FCKeditor/file/dogitasemolaxifota.pdfIn PDF document text
    • https://topupdana.com/contents/files/naletunoz.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091822553435.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/70010951040.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/wixivovigu.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/juxak.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/nabesalivezurofabiwexem.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/gipakekelajadidepubikubi.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/zubutodixusupiliv.pdfIn PDF document text
    • https://costarica4d.com/contents/files/92661604897.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec00ece03---kolubimexolipurul.pdfIn PDF document text
    • https://membermimpi.com/contents/files/dujes.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/jilopuv.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/xinaxunagenufuloba.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202197234749.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210907162436.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a600655c15a5a5955a7972185a583afb/47361738640.pdfIn PDF document text
    • http://hangquangauto.com/files/22943418615.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/60985300177.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/lepuraxamodib.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/xutavunomesewik.pdfIn PDF document text
    • https://energooptima.hu/upload/File/duzodozametixikukatali.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_off0000b89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89E 11524 bytes
SHA-256: 25a2f21c240d4bdb5624450ae5ea2a6bd122337b4eff5f1c97523caa1dbbaa0b
font_01_sfnt_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 16400 bytes
SHA-256: 48284133c718b2d70d0e1f12a03ee97917752735bf8f748d19dfbeceb0fde227
font_02_sfnt_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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