Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb74987fd8a9b4c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-23 18:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40147048d1ee154eace7815ad71f78b7 SHA-1: 10cb8e234d1a6f7a9b0a3b68ee90a8534b8eee6a SHA-256: efb74987fd8a9b4ca0105870057a8a59bd94e1d4ac226569c628e791380fea05
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=base+apk+live+cricket+tv PDF link annotation
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ae80e703---98055458053.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/83477664109.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/kajuranipekunopegazebisej.pdfIn PDF document text
    • https://menu2uplus.com/images/file/42597599094.pdfIn PDF document text
    • https://red-adlay.com/upload/files/11020720750.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/81505809157.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/90494683860.pdfIn PDF document text
    • http://hidramaco.com/files/files/zerejubenejiwedizoweruta.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/xijujimuzi.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/vigogubaw.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/xikukovolawofalasu.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/zelefulavik.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/82775740676.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/vowubeketemuxeje.pdfIn PDF document text
    • https://produse-zilan.ro/files/xekebidofuve.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/68704496462.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/jikerilumawisupilifezupeg.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/39220916316.pdfIn PDF document text
    • http://banquat.com/userfiles/files/60061355221.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/21435898154.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e06ce1141---53178876007.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/putuwuvilimazazunages.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/xojifujuredumi.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_off0000d401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD401 10356 bytes
SHA-256: caef4e7a621bfb26ffc52736d2b85c8daab09ca0330d11d0912c0b2fefd8eeba
font_01_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 17964 bytes
SHA-256: 227962525331cb69a8d0fc4dff43eddbb5d6fb1e9b1ab6c5746e36bd25e76f60