Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed7b04df8c6d524…

MALICIOUS

PDF

91.2 KB Created: 2021-09-16 04:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b48589ecb63456c44b4e0b06dbf8a62 SHA-1: b4f150e2443571e95977061f6927b96915886929 SHA-256: 0ed7b04df8c6d524b375962be32634777c0ab7effdb473d3cc7f32a961d67ae4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://nomylo.ru/uplcv?utm_term=emailing+resume+and+cover+letter+message PDF link annotation
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/vaziwukokuvuxobitolivem.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///58487414215.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/99620423708.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/jorevokilonasunaxuw.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/82590565877.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/96142445730.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/xewilowilasusukadesaxene.pdfIn PDF document text
    • https://atlantidegattico.it/file/41593754832.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4ae3b999---36448354733.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/zurokepovexivinexo.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210902054507.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/kuroxegabonejomopavebixo.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/xiletofanezazomi.pdfIn PDF document text
    • http://swhos.com/upload/files/69569661983.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/26139976778.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210901105237_0prs5t.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/51491108259.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/vadigadidonupororopas.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210914135145_246730321.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/76088646862.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/37612868502.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1803ffa02f2c326333497ed47cd0ab3a/jikexekipo.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/62150006683.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/49056275509.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///85585480091.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/96689137338.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/19063175551.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_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 18488 bytes
SHA-256: 0ad503ce4f4056831850597cec568af26e01196e7accfc2ca8d1d6796b423b4c
font_01_sfnt_off00012e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E27 10864 bytes
SHA-256: 064a0014df2afb2f5973bcb8993b444843e7e6169cf9886e8b6248916fb1bb79
font_02_sfnt_off00014703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1