Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2d77b3c99ef1e9…

MALICIOUS

PDF

74.7 KB Created: 2021-03-10 10:27:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 31e483de03807b4d8bd932a56e8d9c96 SHA-1: cb899f268d42d6259ba6f26c222b5d4c601c557f SHA-256: ca2d77b3c99ef1e910dc113d943e2697f784e1046359f44b1a6bdf2a743b4ee6
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous embedded URLs, with a prominent one leading to a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The document body, though heavily garbled, contains text related to translation, likely a lure.

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://dugedepap.ru/strik?utm_term=traduccion+espa%25C3%25B1ol+ingles+y+pronunciacion PDF link annotation
    • http://bumaga.bz/helter_skelter_1976_full_movie_onlinergo74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402503/normal_6035fd2b4333e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446784/normal_6012ceed5c71e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495257/normal_5ffd3c88a44e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475852/normal_5ff16a0a06a63.pdfIn PDF document text
    • http://net-klientov.ru/vexunakvkmhw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_6037bf97a3b80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_6031d2955dc1f.pdfIn PDF document text
    • http://thrivewebs.com/powogaxusumi36tep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dozuga/12666028513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2de2e44-e8e4-497a-8f12-90134d0e6654/matematicas_financieras_vidaurri_5ta_edicion_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c082f2-4acc-4665-950a-8e436ae94456/monster_problems_2020_cast.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_75ed19e7d60845c8beb6e97373c4641f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/febopa/32393474683.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_f783adb3c95f4ff2a80ddd182a32db16.pdf?index=trueIn PDF document text
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_097fc47648584152a9dc84ff1980426d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4256022d-b075-477a-b0a4-0a01bb9f56d0/honda_gcv160_parts_lookup.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_a3bb8b9a56994b389419881fb0613fad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a8ae86-1899-4ea2-9caa-8719f5fc51bd/27848868425.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 5504 bytes
SHA-256: 48be1a60f78582676cb0a70bc0ec80dd78766d8539740e02d5646d66778574ee
font_01_sfnt_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 11172 bytes
SHA-256: ab5a4d1e9a0b20560f0e7c8afdf218d23beaeb622f4e9d09232996aa1b37d121

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