Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae95fe05add40a2c…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 20:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4b1bc7936797c623ee347bcb2689a7a2 SHA-1: a1d79171491966743e1b050577c4ae93d4cec531 SHA-256: ae95fe05add40a2c3585b24a11f288a21ccbd80e035402a74a1286fe2e34271b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://synerhu.ru/uplcv?utm_term=where+is+message+center+number+in+android PDF link annotation
    • https://10fci.org/userfiles/file/lusakikom.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613567891d306---fozupowujumasuvawijekoj.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/63049151265.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/wovazekafoxosukame.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/dapaxibalosakaben.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109070543151065.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/95385365492.pdfIn PDF document text
    • https://derfo.info/resimler/files/lojomegijufowusak.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/pejuxiwaj.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/dubutit.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/jaberag.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/70845663450.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/momikanerotasowumulemava.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/garexixunifuzikejimepine.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/logawipejegofog.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/bikepejodi.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/66724931912.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/dopupedawujemikimo.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/fapojawisimarerenol.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/70388274576.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/17381033281.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/98147680859.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/51334587136.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/duzevomebipezij.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/zokivebew.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/remusadubevijasa.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_off0000b4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE9 16404 bytes
SHA-256: bd5131b384761c5817441ed7fc1a6d238e7e7ac956cd91106542263ed10dda06
font_02_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 11004 bytes
SHA-256: 8b89d347919498ec0bf3dfb28adbe29db41db09002f5ae39448b4e7ba3aa118f