Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b0892c9e53b038…

MALICIOUS

PDF

107.6 KB Created: 2021-02-26 19:06:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 099acff04d90bcc87d72a277f1f547ab SHA-1: 6c01ebf46e87b691759d5f4450d2ccaf184a355d SHA-256: 87b0892c9e53b03848c9ce2cd34a3a287206b5b60f9104a51caef615143ba6dc
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support this assessment. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=solvent+polarity+chart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482854/normal_603541b005ada.pdfIn PDF document text
    • http://mini-cam2.club/101943851698dzzs.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/66812305229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_5fd60beea3c7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403954/normal_60248794aaf3b.pdfIn PDF document text
    • http://pinerapidsrr.com/biometric_voting_system_pptlfcp6.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/56352638524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_5fdc526e266b1.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/3d_animation_software_for_free_download_full_version.pdfIn PDF document text
    • http://fortysgjdk.fun/rinavokosemhrj.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/boy_roald_dahl_audiobook_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425217/normal_5fe31aca833d5.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/jipowirije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491159/normal_6033c44f065bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402501/normal_5fd91123e04ca.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/57021293177.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pojozija.onlinewebshop.net/context_clues_worksheets_4th_grade.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/judipesokivu.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/81370461140.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00014a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A16 6492 bytes
SHA-256: cf6bcbaf462759e04676f8989e7e87ed4d43c4317550ddbd0c5684ab0bd17b73
font_01_sfnt_off00015a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A4A 5108 bytes
SHA-256: 845bd27b719e77a17c702056435392b7a557b6e1d634732456a0eedad6ab9b90
font_02_sfnt_off00016bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB1 16288 bytes
SHA-256: 7682fdb5a48d64375561da3f734a3376fa45d3a43dc896fc4847a2cebab75564

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