Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e20c0c7c1a78349…

MALICIOUS

PDF

76.7 KB Created: 2021-03-09 16:32:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0b6c37033092c806031d12f7e779b7c3 SHA-1: eb38a39f9147ae1eebff9e03bd0b50bec9043a09 SHA-256: 0e20c0c7c1a783490d269aad755e5cfc8d9cd4c9ad005e367ae89537b6431c44
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically identifying the mass external linking behavior. While no scripts were extracted, the presence of numerous URLs suggests the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/123?utm_term=city+planning+guide+cities+skylines PDF link annotation
    • http://arenaprobet.com/pezamagiwa8ljw1.pdfIn PDF document text
    • http://feelslike35.com/what_is_the_difference_between_modern_and_traditional_kitchenltesx.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/best_movies_like_the_devil_wears_prada.pdfIn PDF document text
    • http://difewemizotik.iblogger.org/jemenukuvaxemominabujelid.pdfIn PDF document text
    • https://sefositudixe.weebly.com/uploads/1/3/4/5/134524400/jofed_pilewugovug_wetozise.pdfIn PDF document text
    • https://lujipened.weebly.com/uploads/1/3/2/7/132740552/xowewe_voxotaxubigiz.pdfIn PDF document text
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/kopawatudo.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/trig_function_graphs_calculator.pdfIn PDF document text
    • https://penoruzeni.weebly.com/uploads/1/3/4/1/134132400/sagorepok-zadetusuvexalix.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/29347346221.pdfIn PDF document text
    • https://bonikelebosobi.weebly.com/uploads/1/3/2/8/132814552/zokabirejolir_popima_puvovu.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/business_flyer_template_free_photoshop8g75l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_2b49023021f54c0a86cdecb5e87a87e8.pdf?index=trueIn PDF document text
    • http://zedofaxuboz.onlinewebshop.net/pathfinder_gamemastery_guide_1e.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/zondervan_bible_dictionary.pdfIn PDF document text
    • http://sisawujeza.rf.gd/european_guidelines_hypercalcaemia.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/raja_yoga_book_in_gujarati.pdfIn PDF document text
    • http://pavasokunise.epizy.com/59702805161.pdfIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_8aa2593900494eb395e4c08020aeac01.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_fc0ee871dae64f348d859ab3e0afd21a.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_5edf4f38fd3e40deb00ad69d58b7205a.pdf?index=trueIn PDF document text
    • http://tososite.onlinewebshop.net/brother_printer_mfc-j5910dw_manual.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_f5b1c44646694a90acec8436a552e7de.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_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 5216 bytes
SHA-256: b5dad3f44b0ea3abe5edb1f162202437d38b62980a5ffa8580d2fd7b92b178df
font_01_sfnt_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 10176 bytes
SHA-256: 78d3cd3cb258c7e53a66d6dcf315e6af1d2429de1f3817f9097c51ea5031d4b5