Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afcb1d6e8cdd194…

MALICIOUS

PDF

89.0 KB Created: 2021-03-20 21:57:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0d12256e5955d132062f19021451e406 SHA-1: 7e721b12b2b6420d314c874764ba58f1f804877f SHA-256: 4afcb1d6e8cdd1943470a4672bc45aae023392f232d0d83b73ddf0643cd71b14
96 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 an embedded URL pointing to 'midufefew.ru', which is likely the phishing destination. The document body, though heavily obfuscated, appears to be related to a modem manual, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/strik?utm_term=motorola+modem+sb6121+manual PDF link annotation
    • http://kinoxca.xyz/android_development_tools_adt_bundlemiwvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_601c68f6ef5e2.pdfIn PDF document text
    • http://ottics.ru/23480965647iooac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_6005e5cd5dbec.pdfIn PDF document text
    • http://xuruwerufasafer.22web.org/47464247080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474450/normal_5ff00be32225c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493200/normal_5ffe8bf242032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_6022d76583299.pdfIn PDF document text
    • http://zumikavu.22web.org/lexical_categories_theory.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449402/normal_5fee1fed2ed90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449627/normal_5fed7653ee1b8.pdfIn PDF document text
    • http://greenbike.shop/193614966690ztdl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://talavapupaniv.rf.gd/mefageneser.pdfIn PDF document text
    • http://pakoxerevigere.epizy.com/banting_orange_list_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/24578470407.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/sivalukazikupujalow.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/4893844698.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/troy_bilt_2410_carburetor_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/45640757205.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/vawal.pdfIn PDF document text
    • http://leguliwopubagu.epizy.com/actividades_para_nios_de_4_a_5_aos_de_preescolar_para_recortar.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/1588689519.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_off000119a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 5456 bytes
SHA-256: 19a3f3e8bfc38998c7ccdac5fe1bae58f573d4a23b0f5cf01c87f2491e00bc8a
font_01_sfnt_off00012c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C20 13060 bytes
SHA-256: 48b35a935634f981a7a79d4217d47b315100c805983815e13d33efb50506f408

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