Malicious PDF — malware analysis report

Static analysis result for SHA-256 5047ce59be796554…

MALICIOUS

PDF

78.5 KB Created: 2021-03-09 14:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 33387232854c4b075889a4bcdc04b573 SHA-1: 41da7ea71ca9deac9d9910eb13b231384bbc9489 SHA-256: 5047ce59be79655461cdaae0b70c12bde7839356c16195dbb65f961353be60ee
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious or unknown domains. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=what+is+geometric+sequence+formula PDF link annotation
    • http://freefire-gifts.com/craftsman_air_compressor_pressure_switch_z-d23361nstw3.pdfIn PDF document text
    • http://cozyplacefor.rest/bixulanemasavuvekio2cuk.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/algebra_lineal_grossman_septima_edicion.pdfIn PDF document text
    • http://bejozenofidon.22web.org/44460708544.pdfIn PDF document text
    • http://remont-pc.website/decimal_tenths_number_line_worksheetswi0gk.pdfIn PDF document text
    • http://frut-tree.site/biostar_h81mhv3_bios6d4ca.pdfIn PDF document text
    • http://lavkavkusa.store/nibofevasidolatok2cpa0.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/zofapebenimiso.pdfIn PDF document text
    • http://nawabopebi.iblogger.org/best_buy_jitterbug_smartphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1262ae4-facf-4123-87b9-daaf61b3011e/48043763475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a1f0c4-8177-4322-a826-69dcd75d16d4/wukorevarodarodigev.pdfIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_efb1f02afd7d4c21a170319826ceda0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/32c649de-8a7a-4479-b54c-c445eadd741a/fokukaworutikas.pdfIn PDF document text
    • http://molulig.epizy.com/gejala_atonia_uteri.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_a617f7d99e7045539866e5bcc7446af4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a0a0c4-c28c-4815-a553-b7bce768dc2f/my_sony_bravia_smart_tv_wont_turn_on.pdfIn PDF document text
    • http://xezaretidatoro.onlinewebshop.net/93165968544.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_708686e29d5645ceb2976170e5e0d9a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db2855b-ad17-49c9-87c6-82fd6b8bdd9a/rulizolukeva.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_b9a8de706d2e4d1d92d53556281de2ce.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_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 5436 bytes
SHA-256: bc5d106f42fbdfbabf2b4728fca03cf5650341091c7cdda069b701ed527d939d
font_01_sfnt_off000104f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F9 11628 bytes
SHA-256: 5635273ab0af4f5ef0930e7ee79659bab868fc99740ab04aa678bd06eef68b86

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