Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5519c4b506286cb…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 02:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5cde20f713330d1a5f7fcf5ff55e1dc0 SHA-1: e1c1317afd92ba4c9d4a08a876b1e483f2144dba SHA-256: e5519c4b506286cb352b3ca4597f5813d431f31ca531d45a3c4769c096f5ff20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or directing users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to exploit user interaction.

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://pixomot.ru/uplcv?utm_term=sexy+words+beginning+with+a PDF link annotation
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/98393681968.pdfIn PDF document text
    • https://chp-travel.ir/data/file/luzidaj.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/72839985618.pdfIn PDF document text
    • http://espokebar.com/uploads/files/xirotatapoji.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/regikonesonim.pdfIn PDF document text
    • https://cooperspick.com/files/22095392763.pdfIn PDF document text
    • http://sgpeo.pl/users/file/seziw.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/pufagulifusemaxezirudadob.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/12926573956.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/2008288402.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/13256505449.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144734cf152c---pelegon.pdfIn PDF document text
    • https://architektor.ru/uploads/file/kamegilumijiru.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109041324555594.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/tukepavalaw.pdfIn PDF document text
    • https://led7.ru/file/torubofizidafozepir.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/53850263062.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/pamalofabavetupe.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/8330168344.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/74722433064.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/xomefewoxuwukuriwakuxon.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/dulolamewanakelulezedu.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_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 17276 bytes
SHA-256: 9d6f511f0051f92053c97136506017968ff5e4253f14baf67cf668dad8fa5b0f
font_01_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 11000 bytes
SHA-256: a563a2cb43656c6f27af37946ae9ea0f0d56e996df9df86dffb0815400f77262
font_02_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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