Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ded73b8eac836f8…

MALICIOUS

PDF

78.9 KB Created: 2021-05-10 12:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c3eddbbd538fc836dd54a0ddd1a31d5f SHA-1: e68d8498d04361121881a82150fe2ea66042e3fb SHA-256: 7ded73b8eac836f86929a0ea9b0fdc604053afadd37a899c5b414cae4d4e63b3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://jottigo.ru/strik?utm_term=how+do+you+describe+poetry+in+your+own+words PDF link annotation
    • http://goxamid.mypressonline.com/2010_amc_8_problems.pdfIn PDF document text
    • http://peludofnor.fun/kilizigzhwc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472763/normal_603b612377e7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454184/normal_602598c671cde.pdfIn PDF document text
    • https://lewumime.weebly.com/uploads/1/3/5/2/135297270/jilek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416331/normal_60437abd18cd8.pdfIn PDF document text
    • http://gelufose.scienceontheweb.net/business_plans_in_kenya.pdfIn PDF document text
    • https://xebokedobonu.weebly.com/uploads/1/3/4/7/134719403/dasolopomoduj-duvavaripajo.pdfIn PDF document text
    • http://olivamebel.com/jiperubosilurabalafudi1x947.pdfIn PDF document text
    • http://nakotigolajeg.scienceontheweb.net/more_exceptional_c_herb_sutter.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/95835959467.pdfIn PDF document text
    • http://fuxuxixigu.scienceontheweb.net/ignition_scada_manual.pdfIn PDF document text
    • http://nigoviwan.22web.org/skip_counting_worksheets_for_grade_1.pdfIn PDF document text
    • http://tizuwaborew.22web.org/nonuxose.pdfIn PDF document text
    • http://tadugebakonuged.getenjoyment.net/62852078138.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/javasax.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
    • http://sutexuvidag.myartsonline.com/is_eso_worth_it_2020.pdfIn PDF document text
    • http://besafetusupug.atwebpages.com/personal_factors_affecting_consumer_behavior.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/mbo_t49_folder_parts.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_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 5000 bytes
SHA-256: 7927fe1b39dc110542cb64908fddf6eb73e87afaad14a2c3c61b69ee57c860c1
font_01_sfnt_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 10916 bytes
SHA-256: 8bc6a073fe03b43699d2f8c759f517276ab1ece49cae193e3e13813d212e29b2
font_02_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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