Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7acc1d594473e7…

MALICIOUS

PDF

79.4 KB Created: 2021-04-26 07:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 55069bd62de977ce6c10f6903ca10198 SHA-1: 3425b67ee23743387c0ec9601d2170ef26055ae1 SHA-256: ee7acc1d594473e752c5d00eaecac701fb3a2d9610cbfee510eea783dd948638
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the heuristic firings, particularly PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, indicate a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ponafet.ru/strik?utm_term=how+much+does+it+cost+to+scan+medical+records PDF link annotation
    • https://manobafezelibo.weebly.com/uploads/1/3/1/6/131636879/japegax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404959/normal_602c30dcc9db2.pdfIn PDF document text
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/moxinawelas.pdfIn PDF document text
    • http://finansi-7.online/nefusibibubezimalopuvivoqdti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_605f37e7e416d.pdfIn PDF document text
    • http://copyrightviolationcenters.com/6178381461358ufn.pdfIn PDF document text
    • http://moreprodukti.com/43901491651hpxvs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423133/normal_601d5895d25a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376379/normal_5ff511337b7d2.pdfIn PDF document text
    • https://topekaje.weebly.com/uploads/1/3/4/1/134109010/nogerivuduxa_latani.pdfIn PDF document text
    • https://bovusobovazova.weebly.com/uploads/1/3/4/5/134596491/3508323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469378/normal_6025be9a488b8.pdfIn PDF document text
    • https://vowawekalumuz.weebly.com/uploads/1/3/5/3/135304311/zobasad.pdfIn PDF document text
    • http://dkmz1.club/barbie_doll_wallpaper_photosuqeyx.pdfIn PDF document text
    • http://wisecreditscore.info/xagowovisoxoxoratogew1a2gy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_8283c7ccdf624bca83110a4e102fac18.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_a352be7c883a40cd9d7e5724fb410edf.pdf?index=trueIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_3e837783d40a48d486cb783253b04443.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_bc8c11a4a60c44afb56db43044b7ea31.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_f848ad9d0fd349e4a5a2f2014bf5519d.pdf?index=trueIn PDF document text
    • https://8d275f60-8e36-4e70-8574-b6d542a617c4.filesusr.com/ugd/dbf6c2_3d730c60f7a04222bed7d1a7f6f2bafe.pdf?index=trueIn PDF document text
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_804b88700a24435891307c8908ee898b.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_d4824121a3d84bfdabe86e64292a2d80.pdf?index=trueIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_e2fb02d3bb36451e95bfd09c1d850fb4.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_4efa91838a1c4350ae0e771f419f147b.pdf?index=trueIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_6762efd9b64b41c0829ab87eea06e76d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 5232 bytes
SHA-256: 8d0ca64fb541b0c61cee4466b86db79a6e90f70aed85d7744ec2d87cb22264ba
font_01_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 10980 bytes
SHA-256: 81a8a0735f94e3f83245e4a0871e3ecd0661c390c981fb7b57160438fcf0e5de