Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c644e69114a3bc8…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 23:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a624f81ceb73894dbd22bdddb71ffeef SHA-1: 507b6aa8e59fa6e6a9d1b73b69c6e4e56686622d SHA-256: 3c644e69114a3bc8681623bdba8046b16d2deaca06e495592a25f63985e86e9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a large number of embedded links pointing to various domains, many of which are likely disposable or used for hosting malicious content, suggesting a phishing or malware distribution campaign. The presence of numerous links and the 'link farm' heuristic strongly indicate an attempt to direct users to external, potentially harmful, resources.

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://cursosadistanciayonline.com/medios/files/18283105712.pdf In PDF document text
    • http://zjleiou.com/images/upload/File/sidabubogotute.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/72499863987.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/22132986506.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/22354259035.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/36887179510.pdfIn PDF document text
    • http://htwy.com/upload/file/viwovonalilo.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/fawilupoxavovomekodobaz.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/53413852231.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/20883519746.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/58193556060.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/melefopa.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/jiwifejulopovuka.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/97760507537.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/dibajaputi.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/63590079911.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/98814185411.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ahlk7uaad8132e0491nbhpidjn/sukisuduv.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/rubukuwukuxo.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/39874278033.pdfIn PDF document text
    • http://lovesenergy.nl/file/82068059391.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/zafasekimesejejanaferuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=wordscapes+mod+apkPDF 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_off0000d04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04D 17696 bytes
SHA-256: 759a3fa56d314e720e09d4db9cf640277f9ac6aedf7a528f3b4651eb59355f2e
font_01_sfnt_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 10420 bytes
SHA-256: ceef370e5a39e06b13c6e2e14e0841a60fdf7e1eb21dc47c4e07fbc7ab84c14b

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