Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c3b51ed7089835…

MALICIOUS

PDF

92.1 KB Created: 2021-09-18 07:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 904fc4546beb8525ca9dfb94b0c384cf SHA-1: f984a100f92a5067c2af2e59b9a286e29f5a5d47 SHA-256: 67c3b51ed70898351d6cb842d0cdfd849384df9df75d6fb762e1c37445aa87c6
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 point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://pixomot.ru/uplcv?utm_term=redmi+note+8+pro+free+fire+sensitivity+settings PDF link annotation
    • http://lighthouse-connection.at/myPix/file/14694464222.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/digatexuvotuv.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/376840945613964fff40d4.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/62497841890.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/48501945138.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0fd47661---33492121187.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/73667444189.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wugidovoberaz.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/29652523035.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/6058767156.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/sixizezokoje.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/dubazarukudutepuxovumowub.pdfIn PDF document text
    • https://cakkue.com/contents/files/77235311255.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/mijameliki.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161455d56dfdbe---79295490389.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/59630389436.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/36776996993.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/rolavezojutevizit.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/zoxifawe.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54619113628.pdfIn PDF document text
    • http://kustari.net/userfiles/file/pavixekobopatorapot.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1561746605.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/sipujo.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/kisokumenadureju.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/65827173180.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/3749290476.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 22124 bytes
SHA-256: efff3ff8f1fae0fecf632ab8b96ade4c7140f9c5da8642aa40c5f9660050a76a
font_01_sfnt_off00011a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 11068 bytes
SHA-256: ad5f5a1272bcc492f23cf4d70c94a25fa0c66b4e68e6d05887822df925461925
font_02_sfnt_off000133fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0C 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd