Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fad62903d23a5d…

MALICIOUS

PDF

180.1 KB Created: 2021-05-07 21:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 04a33c93cb5b3089f0834deebe3eec46 SHA-1: 29eaac20bd52f284c877d6fbfaa55095dce15b73 SHA-256: 84fad62903d23a5dd645720bc756d1843c63b68952d3dd83310b1ad20092d5a3
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with a primary suspicious URL being https://ponafet.ru/strik. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or spam campaign. No scripts were extracted, but the presence of external URIs and the overall detection profile points to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/strik?utm_term=computer+graphics+principles+and+practice+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5fd84c0ed071e.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/nijaraxakaxixik-bejunofunagefi-sevama-bawizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417530/normal_60493e931e4f8.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_5ffe076344e02.pdfIn PDF document text
    • http://dkmz2.club/yugioh_card_guide_legendary_decks_2ltl5m.pdfIn PDF document text
    • https://leneguvajetuse.weebly.com/uploads/1/3/1/3/131380977/getepib_zabulidut_janejusanotuve_gerazafuleposum.pdfIn PDF document text
    • https://xikisujegowo.weebly.com/uploads/1/3/1/8/131856166/fd50443c35cafe.pdfIn PDF document text
    • http://moreprodukti.com/nitro_pro_crack_bagas31bmnin.pdfIn PDF document text
    • https://loropigofog.weebly.com/uploads/1/3/4/5/134595907/reniputolukife.pdfIn PDF document text
    • http://hookup154.online/alvanon_dress_form23kdz.pdfIn PDF document text
    • https://vadopesi.weebly.com/uploads/1/3/0/7/130738994/9d77dc924ba372e.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/kajepizexov_navab_figitor.pdfIn PDF document text
    • http://juilopkiretlo.ru/samsung_smart_tv_43_price_in_pakistangb9fq.pdfIn PDF document text
    • https://tufemetu.weebly.com/uploads/1/3/4/8/134887907/f593f7e75ce77f1.pdfIn PDF document text
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/5400974.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f939073-77d1-4307-aaa8-42539c8515e3.filesusr.com/ugd/85c9df_5c704320c80c473e91d72cee00cc356d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevelel/pefobi.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/afib_ablation_guidelines.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_3bfeff608fae43c8a3dd08e3b2b7cc83.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
    • 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_off00026c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26C31 5476 bytes
SHA-256: df968f71b7f328e8698abe1fe5d9f2a2dcf61ff9804aaf34d19240937ea5ca3d
font_01_sfnt_off00027e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E9F 15324 bytes
SHA-256: 1b09c130985addd6acf47004981c6ec2fbd3809fc653fe43be26280eb1797902
font_02_sfnt_off0002aca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ACA6 16100 bytes
SHA-256: 863fb4683b3a2cde7e0fcad73ede17175693e746f2889ff75aff45380ac4d6af