Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcf03ccdcc992fa…

MALICIOUS

PDF

77.6 KB Created: 2021-06-08 03:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 525562b9324f59f6e45364b5dc2ac07e SHA-1: 1f9a5788064e655ac2b66e11feee47e2ea739e80 SHA-256: 7fcf03ccdcc992fab05bb8917e13c78f02ecf7bafa0632af7865d8bc49c5dc3f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://chcial.ru/pbw?utm_term=national+lottery+funding+application+form+2010%252F1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388626/normal_605f28ffc327a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_60571f1e96dc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486197/normal_5ffba9b3718fb.pdfIn PDF document text
    • https://kuxivudu.weebly.com/uploads/1/3/0/8/130813582/64dd76023f9b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365570/normal_5ff881c0b4f47.pdfIn PDF document text
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/lolojaraf-fikivulu-ronowetiz-bipipimutaxoj.pdfIn PDF document text
    • https://bimeximuwodewo.weebly.com/uploads/1/3/7/5/137514413/3181443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482020/normal_6029b4f972272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_5fe8fac7aa106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455183/normal_602ce4b1a63e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_601f8a3ad872f.pdfIn PDF document text
    • https://gitapelo.weebly.com/uploads/1/3/2/6/132682700/55596e192ba1.pdfIn PDF document text
    • https://bugibupezo.weebly.com/uploads/1/3/4/7/134711935/e6505984998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451563/normal_6031264dd4472.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/efee8066-81af-4468-8626-24ebf7d9c112/27815126421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bf6ad5-6605-401b-a177-b67ad554a09a/ps_vita_2000_price_in_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb4d49a-e108-46dc-95ca-25045b9d2a08/80439846525.pdfIn PDF document text
    • http://sawebaz.pbworks.com/w/file/fetch/144762786/chromecast_app_windows_10_version_7.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/f/tejaboratifafelufugumesi.pdfIn PDF document text
    • http://zewalar.pbworks.com/w/file/fetch/144596508/dork_diaries_13_free_download_e4thai.pdfIn PDF document text
    • http://favixose.pbworks.com/f/sosigomalekegetifinerila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe348577-e3c9-48b7-a5c3-736428eba78e/29528233794.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 5732 bytes
SHA-256: 24630e87cdc8cf23b080dd0ea7f75d98c45b724524ed89815ba264de27161a84
font_01_sfnt_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 11288 bytes
SHA-256: 2f0aa3972f33c682b152313c697daf9f3a44cfe4693811dde039d64c8a36bd88