Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cfe1c03cda06a0…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 06:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19ac5513a1d64f73b1527e9cb7dab002 SHA-1: dbde4afde987b6fec6bfed3dce92d035d14d42f9 SHA-256: 52cfe1c03cda06a0419939c6da18332095ca7bc2c314ca1ae3f5ceb3e03aa699
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs, including one that appears to be a redirector with UTM parameters, suggesting a phishing or content-luring scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support that this document is part of a campaign to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=the+new+mutants+full+movie+online+free PDF link annotation
    • http://paglialonga.it/userfiles/files/58429281603.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/tivimevidotokim.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/88661979597.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/55838931162.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/50463316883.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/24477474558.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/80885832168.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/tedatugetoridufixi.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/25814658810.pdfIn PDF document text
    • https://melz-feu.ru/upload/nonogaj.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/37810458384.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/bugedugopibilerewule.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/febebetusuzodiresatejowe.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132848ad60b8---gifokata.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/79117164529.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/sawipow.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/juradufofabove.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/20226217800.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/garasanopadesu.pdfIn PDF document text
    • http://synfarm.com/upload/files/93160042888.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/2833299393.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/93402712288.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/geweserupurakiv.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/92558765744.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/38429978024.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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 10696 bytes
SHA-256: 5fb7f5e6ee8dc287a39ca11c2ca41914897cb059b5341835d5353c07090bafa8
font_02_sfnt_off00010658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10658 17272 bytes
SHA-256: 5e75be7e994dcb9582bbc7be5756ea1e1499d3a3c44a1e912a47bf089926e0ab

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