Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07cbba81bd2467f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-29 13:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11399484906f15ea2daeedc214ad32bc SHA-1: bb9ee4f434be6326299d2e21eff147d13f20cb0d SHA-256: f07cbba81bd2467f218bb48082c21e57b58e3dc5e87aac4c489b6cc3298c01ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or scamming by directing users to potentially harmful external sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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://catamma.ru/uplcv?utm_term=seo+keyword+online+tool PDF link annotation
    • http://weddingdove.tw/uploads/files/202109050513357633.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/47951451309.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/wejefavigati.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/regarujus.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/kiweragugidudabapiwin.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/xapipitinazedujanuvagagil.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/26018930306.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/56926558251.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/weberitosojuluninerazoviw.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/kefuribagozedewokugut.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/finotobazajurumukejiwivos.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/fegivaduxibilotumewetiko.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/51205491780.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/17962237188.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/wavujaxipatiduz.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/53116484909.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/826030dac69b10547676b43da1fbe1fb/34339165639.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/sogokaxiviwaneneduxe.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/pigezisiwikol.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131495f41faf---29976992709.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/22451928449.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_off0000b410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB410 10280 bytes
SHA-256: 0bd9bfefe00c28ab9ded83cc95da3b132dd68fc70a929689bb0ec0d1834d5c8e
font_01_sfnt_off0000cb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 18384 bytes
SHA-256: fa97dd23c568d1d7d0efe679b4104c2f539ffb0e42d0b5537d087a869d8adfcb
font_02_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1