Malicious PDF — malware analysis report

Static analysis result for SHA-256 162d2f25d5e038d8…

MALICIOUS

PDF

69.3 KB Created: 2021-06-04 22:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0a28665e372babb0036829266e24a805 SHA-1: fad8ec72ff8e0b390db80d2403bca62381bcc64c SHA-256: 162d2f25d5e038d87e6c5338907bcd947f7035cc0a41eae266858b6d01399b86
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'nomylo.ru' and a heuristic indicating a link farm on disposable hosting. The document body, though heavily obfuscated, contains references to 'Gigabyte ga-p35-ds3l chipset drivers', suggesting a lure to trick users into downloading potentially malicious files.

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://nomylo.ru/pbw?utm_term=gigabyte+ga-p35-ds3l+chipset+drivers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482872/normal_603f28065b955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_6050e51ca6379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_602bac94a7a64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fcf3f2ade310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409616/normal_600c67b6ee30d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366407/normal_6005eeba8ddad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_601e82b4dfe16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470961/normal_5fe18c2c4ee6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paditoxef.pbworks.com/f/wosig.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/58056010122.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144412656/kewobiwelomoje.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/47643596869.pdfIn PDF document text
    • http://sawanixum.pbworks.com/w/file/fetch/144521208/achy_dolor_de_hombro_y_brazo_derecho.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/f/descargar_capitulos_de_la_casa_de_mickey_mouse_en_espaol_latino_mega.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/w/file/fetch/144519957/wibak.pdfIn PDF document text
    • http://gitixofipoxu.pbworks.com/w/file/fetch/144610185/78211630363.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/jeepers_creepers_2001_full_movie_in_hindi_dubbed.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_off0000d008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD008 5988 bytes
SHA-256: 976b9f6887186c5799dad7ed12322413cedd91a2813c3735cf652534805d5df1
font_01_sfnt_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 10428 bytes
SHA-256: c4f47d787f9da9e7e2116ae65a1210c5e8ef798c5b3673848cfcc5ff0f2fa21a

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