Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba98ca788495038…

MALICIOUS

PDF

89.3 KB Created: 2021-05-14 00:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5599285b8dafe0f197197e67861b5dd7 SHA-1: 40de2d7c23f0180cc2d906947b8c6b6ca08038b0 SHA-256: 0ba98ca78849503879fa251d34effe6b83a5ba647ea206cf039ff415cb633cb4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and includes a UTM parameter suggesting a tracking or campaign purpose. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or ad fraud. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=what+is+a+construction+phase+health+%2526+safety+plan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454167/normal_604e83fd45651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_602e71a6e39c2.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/e005633ad6af2dd.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/kezeninajojagaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_5fe68745eca74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_6061e9c12a71c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410191/normal_5fe15ef438c83.pdfIn PDF document text
    • http://ladebizelase.scienceontheweb.net/aura_carlos_fuentes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377407/normal_5fca7e3d749cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413242/normal_605ab86894ae7.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/zoxidasida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_60637080bd282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412165/normal_5ffcd3c0c402f.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/rurimupudutaguselumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_601307114f490.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://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_ef994b70e1384e31b73206542f430364.pdf?index=trueIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/freestyle_shark_classic_watch_xl.pdfIn PDF document text
    • http://wurebosuloxu.myartsonline.com/dovekalelulij.pdfIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_4756c66a4e1a40daa870758b0620372a.pdf?index=trueIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_d2eabd8469554d6984fd4ec6cf458ceb.pdf?index=trueIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_969b5d351a3748e38969593d332241c9.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_e9ab03e835af4543a22760ccddfef5f6.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_off00011422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 4916 bytes
SHA-256: 687167adc6b2400992cce944675e1aedb11a6c7e2a59d00766ace0b6bfb81636
font_01_sfnt_off000124cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CD 10836 bytes
SHA-256: 9c8d036ccc2eb5d1125fd23e6b1ddfaa5fbd4b1cb2866b982347ce51bcae9c45
font_02_sfnt_off000149a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333