Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e36c5befc4a9ef…

MALICIOUS

PDF

71.8 KB Created: 2021-02-01 19:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 83c6d9b4c3f61446035ee5ddbf98f8da SHA-1: 5231b1fa402bfc03c8af0386326839edfce6e849 SHA-256: 83e36c5befc4a9ef989081bee830396022962e025251ea65e5041bc6ee807f3f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, with one prominent URL leading to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to academic answers, aligning with phishing tactics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing or malware distribution site.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=algebra+1+chapter+8+practice+test+answers In PDF document text
    • http://idealica-italiaoficial.site/chromatography_multiple_choice_questions_and_answerszwrrc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420764/normal_5feb094942ea1.pdfIn PDF document text
    • http://astrology-personal.online/45843441785ej4mz.pdfIn PDF document text
    • http://legiontry.online/growtopia_harvest_fest_calculatorc3gjm.pdfIn PDF document text
    • http://testvvd.xyz/adam_khoo_forex_tradingbpykz.pdfIn PDF document text
    • http://hristogrigorov.com/zombs_battle_royale_download_480pjdrhi.pdfIn PDF document text
    • http://supermagazforsale1.xyz/403283006548fuh0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426066/normal_5fda692c49724.pdfIn PDF document text
    • http://olivamebel.com/sozavibajisomujasuki8246m.pdfIn PDF document text
    • http://muwusus.iblogger.org/burundi_gospel_songs.pdfIn PDF document text
    • http://hookup157.online/zitodaxevosimapovapazekuzk6l57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461232/normal_60109cd3251f2.pdfIn PDF document text
    • http://natgood.space/fidamimi75uj9.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/pegozegi/mobile_movies_mp4_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/lijuwaboze.pdfIn PDF document text
    • http://savefativiluz.epizy.com/roxakatebare.pdfIn PDF document text
    • http://xakafof.rf.gd/architecture_resume_template_free_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/69384041014.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/58897800757.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_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 5664 bytes
SHA-256: 98cad4ae15f630646ab56b5c35d002a653e781ea8b363b12f1d882f659122901
font_01_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 11480 bytes
SHA-256: 8473d203b6095b525903411202e9e7e2dcf45e20a41417931320a4fddab85ec1

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