Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ca36edf950c1d9…

MALICIOUS

PDF

85.2 KB Created: 2021-02-15 05:52:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6548bd67b0580a9dd809ec8bdd803539 SHA-1: 73cf558077705e5015daeae6c167b2bc1966057e SHA-256: 52ca36edf950c1d9aacdfdcdc907d60c7c09dce5cf11bd464c0a4ce04d91beea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. The embedded URL points to a domain that appears to be part of a link farm, likely intended to redirect users to further malicious content or phishing sites. The PDF structure and heuristics suggest it's designed to obscure its malicious intent and lead users to external resources.

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://bologen.ru/wix?keyword=charm+king+hacks PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496193/normal_601f0fdbc893d.pdfIn PDF document text
    • https://cdn.sqhk.co/lovojekaboxi/ahcoibI/capital_group_american_funds_retirement.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/T1vhdRW/pixel_car_racer_mod_supercars_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367919/normal_5fe1324d253ce.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/kabudikamikixarebosr1dwk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_601fcb291de92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482012/normal_6029557433201.pdfIn PDF document text
    • http://podeves.xyz/72756732618moswq.pdfIn PDF document text
    • http://latuha.com/nunuzozapadkyqw.pdfIn PDF document text
    • http://sale20.site/bharat_gas_app_freel0a6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464314/normal_5ff6d3e68214c.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/mejigavukolu/legon_admission_letter.pdfIn PDF document text
    • http://suvoxezol.rf.gd/44424962424.pdfIn PDF document text
    • http://vomovawesojuti.epizy.com/dulamutifone.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/95274475239.pdfIn PDF document text
    • http://jogisav.epizy.com/punjabi_couple_full_hd_pic.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_off0001141e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 5148 bytes
SHA-256: fede2c64ef2b4b1055d3d6856b7cd65fec7f5a2bf2e14c9624d9e1bc6893ceef
font_01_sfnt_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 10212 bytes
SHA-256: 9ebca8574626a2be856f11eb2ad27c8116bb621992c2ace48adcfb8c64f6a932

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