Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61f524c72859994…

MALICIOUS

PDF

82.8 KB Created: 2021-03-08 22:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8ba8186e41126918bb8fc489adb1c5e2 SHA-1: 277d1174e41e56c30ec50d26c4a90689373c73c6 SHA-256: d61f524c7285999486c8463661b481d72a5c337fdab562a74bde12d8222b987b
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/123?utm_term=bsc+nursing+form+last+date+in+rajasthan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5feaf0dd0b8ed.pdfIn PDF document text
    • https://cdn.sqhk.co/zivupowixede/eevghhf/31687595822.pdfIn PDF document text
    • http://ptmonline.ru/44276224697b1lr4.pdfIn PDF document text
    • http://onlinetyz.xyz/nanda_nic_gratisdc38e.pdfIn PDF document text
    • https://cdn.sqhk.co/vumajotiwog/hehdhdk/4289128789.pdfIn PDF document text
    • http://compte-cmbretagne.best/36482327872p6aib.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/jugotomijuorn75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372702/normal_5ffb3c44ca314.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/ejehaij/kunavisobakojowiwagemo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389376/normal_5ff7838bec151.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/1gfjdEK/verilapubebaxo.pdfIn PDF document text
    • http://momentshop.website/jquery_validation_stop_form_submitwlozp.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/dibifje/20225434921.pdfIn PDF document text
    • http://white-x.fun/pearson_books_downloadfv2bz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425230/normal_5fde3e4da302c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462694/normal_6000bdef0d9bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_603862b0ddc85.pdfIn PDF document text
    • http://wrinklestiltskin.com/dorf_electric_circuits_solution_manualan9ny.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471711/normal_5ff05e9b15545.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_36c6e43cb1914a4cbb063d13f038564a.pdf?index=trueIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_cd272d3457a44ff0980a4a3b84d70792.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_30a2b61b45734006b32e19eb0b21e463.pdf?index=trueIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_af7a40fc0ba4410596d5ede5ff8530bf.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 5444 bytes
SHA-256: a864ba9aff8ba524889a1e723e596617229466a31411993dff37be8b535df5ee
font_01_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 10880 bytes
SHA-256: b8ad760b1825388faa85871008355ec14c984c31f24ed0b9251c3f7f12ed0590
font_02_sfnt_off00012dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3