Malicious PDF — malware analysis report

Static analysis result for SHA-256 194f12976e4ca874…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 09:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3cf1f9e372bf62a9715ad71fdd9b1cdf SHA-1: c45cb2d6a84a629c6c273b4311df1822e3d6e2e6 SHA-256: 194f12976e4ca87422e3c06e5da53e07a69666c8ba4c073d5ae2d78430759077
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://muachungbaohiem.com/uploads/userfiles/file/xixakalekukovifuwufas.pdf In PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/92438992507.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/welomugaxezebibikuv.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/zulagitivogupe.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/16524614899.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/17700853026.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd3a361767---fifujij.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/71865704684.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/6997872214.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/59717972426.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/68274834543.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/tiguwolaligiled.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/vawod.pdfIn PDF document text
    • https://faceless.me/userfiles/files/zidesogakexowadunusi.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/80488451230.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/69124860752.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/bopusikubovavavijosalobip.pdfIn PDF document text
    • https://arerp.kr/data/file///42887511961.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/64482259922.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/mibuf.pdfIn PDF document text
    • http://geose.ru/userfiles/file/16715388085.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/taburenabipuvatexusesav.pdfIn PDF document text
    • https://afma.pt/site/upload/file/guwuzubesoxogejigosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dj+edjing+pro+apkPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152656fabd56---wibaxududelop.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_off0000b13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13F 17080 bytes
SHA-256: e6c0de2c2d955b361a16c781492847ab768ec6373db9c20b8d5f6d28812fd59b
font_01_sfnt_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 10480 bytes
SHA-256: 4a05c6f872c2af49711746c6a2df74a77d91cb572ece5bfec1a0a433fc038e3a
font_02_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1