Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3543e9aa46513d…

MALICIOUS

PDF

76.1 KB Created: 2021-09-28 09:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5318c586d76c21beb125326345ae5592 SHA-1: f72de1a56899f0cc736e9701fe3b7920616180db SHA-256: ca3543e9aa46513dae964a294a2418cfac9a7c7bfba42aa49d51248e0bab8a78
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. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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=bestie+camera+360
    • https://egyptsuntours.com/userfiles/files/97303218639.pdf
    • https://yuanfuconstruction.com/ckfinder/upload/files/bijiwifineti.pdf
    • http://forepic.com/_UploadFile/Images/file/nosebimagomajiwikuru.pdf
    • http://timavoshipsupply.it/userfiles/file/kifiremo.pdf
    • http://masterref.ru/editorfiles/file/22821748525.pdf
    • http://fullx.net/files/gifufepigibedokaxebiso.pdf
    • http://aytekinpolatel.com/image/files/gumuwoditaxu.pdf
    • http://mybed.tw/uploads/files/202109141226341106.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146380e7f62c---vavidadobavuv.pdf
    • http://pwmtqatar.net/userfiles/file/90613821472.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/31918830641.pdf
    • https://natinsel.com/imagenes/file/rixojukunurimuvenuwulilan.pdf
    • http://writtenmail.com/upload_images/file/mekigakebatasisojamog.pdf
    • https://superpart.com/files/xometejugigofowi.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a94f8d0c637d2ca84832f8fd49ef6593/jokoruvifewun.pdf
    • https://metnar.pl/web/uploads/files/52389664080.pdf
    • https://nuteuit.ro/ckfinder/userfiles/files/62336072534.pdf
    • https://alstar.uz/images/shared/file/jodesilomimatam.pdf
    • http://hopkim.vn/upload/files/83764391839.pdf
    • http://savvyais.com/userfiles/file/55058427797.pdf
    • https://sunnyrosesschool.com/userfiles/file/19674490530.pdf
    • http://ackerviewguesthouse.com/userfiles/file/tepotinikuginelopoperunu.pdf
    • http://moscowfashion.net/content/xuploadimages/file/xikemuwiredavexive.pdf
    • http://choragwica.pl/userfiles/file/40220793182.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0c9.bin
c2d54bc96be3387affb9089039e363a94444589bb8dd8c86f6a44473e23a1726		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C9 16676 bytes
font_01_sfnt_off0000db63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 16792 bytes
font_02_sfnt_off0000f37a.bin
aa8b3acb8c89274c49ca4978c543fa49efb6cd9c463143aca90f7a77bf308aa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 10636 bytes
font_03_sfnt_off00010be8.bin
0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 16448 bytes

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