Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50f4dcd83494c06…

MALICIOUS

PDF

79.1 KB Created: 2021-03-22 06:57:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 96d555d6222085691ed319cb5cc6efac SHA-1: 54ef725cc1c250b47ce82cdac5bc9a255da4e2f7 SHA-256: f50f4dcd83494c06776e55acee19bc91fd2afc818dcda05bf7fce350e52eca90
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=do+polar+molecules+have+a+net+dipole+moment PDF link annotation
    • http://bumasujofoj.getenjoyment.net/55511344586.pdfIn PDF document text
    • http://lamejix.scienceontheweb.net/city_of_bones_movie.pdfIn PDF document text
    • http://kilekapalovuzo.getenjoyment.net/fezujopoze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lepugip.epizy.com/andrews_college_kolkata_garia_admission_form.pdfIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_37b4820c3e964ef98d8235b9fc7c6c12.pdf?index=trueIn PDF document text
    • http://wajalapivibobi.epizy.com/43283953510.pdfIn PDF document text
    • http://lozosotozaroxi.rf.gd/gazitav.pdfIn PDF document text
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_07a0c82af97e457bb99f3d4b2657edaf.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_b20037d24f4e4c679c6a1b8ea9b606b9.pdf?index=trueIn PDF document text
    • http://kusegipe.epizy.com/introductory_mathematical_analysis_11th_edition.pdfIn PDF document text
    • http://binasizula.rf.gd/spreadsheet_for_apple_free.pdfIn PDF document text
    • https://26aaa629-0581-4e25-ae32-a194504e59ab.filesusr.com/ugd/2d4e87_dcf755e9ff094aaa83d494b72b3d0e06.pdf?index=trueIn PDF document text
    • https://57ead060-d7b3-4f59-a803-6c9b47c0028a.filesusr.com/ugd/f30481_cc2eb5c6dc464b79a7e63fcbc09206f9.pdf?index=trueIn PDF document text
    • http://saxarivoje.onlinewebshop.net/jakixusutapunuzu.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_0f48bd26489c41b6b931cfd477fc9941.pdf?index=trueIn PDF document text
    • http://moxadokikubod.onlinewebshop.net/raxefatizamelex.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_4b551678ed3548789f4a993afdf41c0b.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_2e5f38c3d06b4827ab2d535ef2cbf865.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_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 5372 bytes
SHA-256: e990a57138192155cb4c44b8cc309c35ef9dfece2ed94b723171860044e9ab46
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 11904 bytes
SHA-256: b1e5d505c20b4ad043ab7c9af2245720662fa8087f9004590d689fe13c63ff27

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