Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0ad7524dffc1f5…

MALICIOUS

PDF

66.2 KB Created: 2021-02-28 06:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3843616c9874ac68d977d6afe719d7f3 SHA-1: a32f8ff6174c34e2c47a4edb25ff5967efc6b260 SHA-256: fc0ad7524dffc1f500de36af03aef3dedda8174b25b8b6f12282fe11a186ac4a
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'jacksth.ru'. The document body, though heavily obfuscated, suggests a product listing lure. The presence of external URIs and link farm characteristics indicates an attempt to redirect the user to malicious content.

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://jacksth.ru/strik?utm_term=turbochef+tornado+ngcd6 PDF link annotation
    • http://mumiwimag.iblogger.org/72038129826.pdfIn PDF document text
    • http://gtmedis.com/80094570278gsgss.pdfIn PDF document text
    • http://muvisaxof.iblogger.org/angels_and_demons_book.pdfIn PDF document text
    • https://pufokebisuniga.weebly.com/uploads/1/3/5/3/135324869/levuk.pdfIn PDF document text
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/339017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_6013dbbbe25e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_6014580b83336.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/bisegilupuf/missguided_bandage_dress_red.pdfIn PDF document text
    • http://jeragapa.epizy.com/28222344618.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/dofakizal.pdfIn PDF document text
    • http://kevakop.epizy.com/whatsapp_de_colores_apk_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/teladefebet.pdfIn PDF document text
    • http://loxazugexola.epizy.com/55257799383.pdfIn PDF document text
    • http://tunarijog.rf.gd/vavuti.pdfIn PDF document text
    • http://nosifunugiwes.epizy.com/29541253982.pdfIn PDF document text
    • http://lidekajemunow.epizy.com/buvupusawiwisalaxekujil.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_off0000c74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74E 5316 bytes
SHA-256: 207a24cd0671624689a327541312fdbc0820d0b8972c5fcb60a1288bdeec2cfc
font_01_sfnt_off0000d95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 10300 bytes
SHA-256: dafce39fba5ca1e880813a5001df57864d2f323cb1ded3f2e154cec5e0f08ca2

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