Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c64258e167d91cf…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 01:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a768daf00bb552e095badab7bc6b9b3 SHA-1: 61a941e2d75c154a29ee40b39daba8793c5eacaa SHA-256: 6c64258e167d91cff62d812ef600ca6e1d9bcd459a898c3e1adacfbe978ae222
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ketchas.ru/uplcv?utm_term=hcg+pounds+and+inches+pdf PDF link annotation
    • http://grotech.in/userfiles/file/wawixivolirebaweva.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/31072928672.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/45969552917.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/95263035939.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/33759279158.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/87882315644.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/makomejagi.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/90061210910.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109020328457263.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/53673472100.pdfIn PDF document text
    • http://asqcert.net/files/files/tujumakebaxaburutede.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wulixifajitugupu.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/28346542359.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/lajatejasexepufala.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/nawisofanujakugalonudoz.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/20225291826.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/51736899705.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_off0000d73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 10748 bytes
SHA-256: ede0d9b097a8537d55197baf8fa98b77d7672442a8f107b3a126bbaa7e3238d6
font_02_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 17896 bytes
SHA-256: 76c455fb9e336837be8d30b34e4635073ec9bd67a27506cf9a2969e5433c4135

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