Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38f02b26336acda…

MALICIOUS

PDF

82.0 KB Created: 2021-03-16 05:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 71356aabcfa6257c73fa4bc41310ef5e SHA-1: 5439d8ee7bfa14a188f95926d86e06de808fbf79 SHA-256: e38f02b26336acda740e76c9e7865754ebd37519c5f290cfc111b402a9a76fd2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily corrupted, contains text related to 'English time review PDF', likely a lure to disguise the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/123?utm_term=powt%25C3%25B3rka+czas%25C3%25B3w+angielski+pdf PDF link annotation
    • http://aov.one/tuwaxatipivudimagotiwosettvks.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/sutiwafomevetasuzab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496380/normal_6040429f4000c.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/wuxun.pdfIn PDF document text
    • http://linodogeb.scienceontheweb.net/rt-n66u_c1_default_password.pdfIn PDF document text
    • http://teachost.com/sweat_by_lynn_nottage_synopsiska1ri.pdfIn PDF document text
    • http://vixegoxufareka.getenjoyment.net/how_to_start_fl_studio_20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460983/normal_5fc8de2c4780f.pdfIn PDF document text
    • http://vobajujabu.mywebcommunity.org/familia_asteraceae_en_mexico.pdfIn PDF document text
    • http://nazhivy.net/sig_sauer_sp2022_holster_level_3mtpo1.pdfIn PDF document text
    • http://monanuzusud.22web.org/13617934141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459623/normal_5fe6321e90b78.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/como_preparar_un_bosquejo_biblico.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/comptia_linux_guide_to_linux_certificationjr10w.pdfIn PDF document text
    • http://ludshop.xyz/xabigodozitunivarigcmq41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pasutiz/lunom.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/xilipukosigora.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/foramomunobubevev.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/ruwupolamile.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/77086914829.pdfIn PDF document text
    • http://wepogevadapafa.atwebpages.com/informe_sobre_calicatas.pdfIn PDF document text
    • http://genoropafetado.epizy.com/cg_video_gaana.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 5452 bytes
SHA-256: 72d33d560dbf8e14fa79d0bba300b1ab29256f186ee1023b15c52ca80c383db5
font_01_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 11984 bytes
SHA-256: 038011fc142ffcaf1a822356b0a8d5acba35b6de8ecc1daf54206361f7cbdddf
font_02_sfnt_off00012a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A93 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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