Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab01779a98f0d2aa…

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 02:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2044095e829a5229e58edda855bc0c18 SHA-1: 7243c581d92af6de9285dc19a18eb589fa2e377c SHA-256: ab01779a98f0d2aadf9ab3045785d107d1e45d265bb3b5daced8b4f5d2a9db7a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=gunjan+saxena+movie+online PDF link annotation
    • http://gardena.crazyrockinsushi.com/uploads/files/11485737178.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/76414745781.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/40505477941.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/2623702389.pdfIn PDF document text
    • http://intertravel.hu/_user/file/dusexuvazisowipaj.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/luwunota.pdfIn PDF document text
    • http://art-ball.net/files/file/29484412137.pdfIn PDF document text
    • http://szwygs.com/upload/wokidi.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/saviwufutadi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/88d6f540687d10b2e6e7f2df2ab8ba82/3686583983.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/tafaxesegenujusor.pdfIn PDF document text
    • https://sergiomauri.com/images/file/78486486183.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/xunukusof.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/25595020130.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/97560432787.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/7607297750.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/zokomujopelunudojum.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/84456403965.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210906_0D63F5BBD76B8DE8.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/zikuloweposofalolazodagax.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/33272778816.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/pezori.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/83935373908.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/54940301424.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/vodekij.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_off0000b2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEC 15912 bytes
SHA-256: 9d1421e619c445f3029737febc1fc0814c2e03f885efc16319452a5bab485325
font_02_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 10508 bytes
SHA-256: 4977101bbd03e054e3d7746cfeb0740204fd07c0fa8b7efff7b69b1109104234