Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56c0ec4d86bc73d…

MALICIOUS

PDF

105.7 KB Created: 2021-05-19 10:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ef16c04eacf020599a049753b6766cd0 SHA-1: 165ab8fae3bc326ff20292e1f6522b132db579ff SHA-256: b56c0ec4d86bc73d1bdbf98e3df5300857ab5f3134d1dfe1e2769b3fc7bfbb90
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 numerous embedded links, many of which point to disposable domains and are presented with a "rules for discord servers template" lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=rules+for+discord+servers+template PDF link annotation
    • http://sorebifisawug.22web.org/majakumuse.pdfIn PDF document text
    • http://wufutawolemipa.22web.org/31155599759.pdfIn PDF document text
    • http://josuwuwopow.22web.org/sezexamonukebapinezogo.pdfIn PDF document text
    • http://zarebuvovupudu.22web.org/23840684719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490133/normal_601fdfdf758c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_602cdae32a987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489846/normal_601b63ed992aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taxifegizuni.epizy.com/lulijorapuperunexegup.pdfIn PDF document text
    • http://kodeketabekem.epizy.com/ansi_c_programming_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/xazulisekojukupuniwudu.pdfIn PDF document text
    • http://rovetenexosa.rf.gd/45279439390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03e5b26-5419-4bab-a793-a81c6aa8367c/tom_clancys_rainbow_six_quarantine_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c61822b-69a5-4122-8f4b-85463db94e2b/90361500961.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/committed_cost_report.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/95589764094.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7A 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off000147bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BD 5368 bytes
SHA-256: 45201519ffc9ac90a04731e6687d562e41719c8b2e9d893ee075d4df4d9ed9e8
font_02_sfnt_off000159f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F4 12296 bytes
SHA-256: 6ff036e572fcfb0b813b37d1fd65dac1d3e35d9c5e0e5519dc3f9d2359b2a4c3
font_03_sfnt_off000183d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183D3 16232 bytes
SHA-256: a19f3725bb2d1996f11dc93f597fc5969c2f04d8eedd23adc23276ee10203391

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