Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1b525d233b188b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-29 14:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9063998332bb4ad3a14502d47cdee342 SHA-1: 2336fc1ed44adf043301d7dac04bf77e1cef8e0c SHA-256: 3a1b525d233b188b04e85f39ccc85c93565757f6c83cbaf89d29791d72841913
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with spearphishing attachments designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=alien+shooter+download PDF link annotation
    • http://katour.ru/admin/ckfinder/userfiles/files/lujer.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gigseuflv70jf8hk0hgom89k84/wajupenixo.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161455eebd5f3d---32732129569.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/45830865886.pdfIn PDF document text
    • http://tai-group.com/upload/files/lejubodi.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/29499797929.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/gabepoxipufiguwasidaku.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/jutumudijazijigu.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/xiroratiwudevawabada.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/zudagojawininamilorajot.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/pilotelogipoxofakibixi.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/81171052553.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/45091257987.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/36472692264.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/katinav.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/52881627191.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/lixesepapa.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210914101521.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/nezakowalurowemuwuwubiv.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/86129213208.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/nuvulesodadaza.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/wimuguzomar.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/62711911887.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/71097347011.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_off0000b4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F8 10412 bytes
SHA-256: 8fb9810f29b7fe62fc5a7625368fb9a555f8f9814ffa25fe08fccca2e3d40b59
font_01_sfnt_off0000cc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 18620 bytes
SHA-256: 5464e32242ecff124f2bc33f027e3c84acc97ed09face8d5587810783a95b1a0
font_02_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1