Malicious PDF — malware analysis report

Static analysis result for SHA-256 31752efc5ce08934…

MALICIOUS

PDF

78.6 KB Created: 2021-02-27 21:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f348da251be289e8f3e31f6eabfffd11 SHA-1: df78832c6177999db7bcf7fddf3a96be0d8484c4 SHA-256: 31752efc5ce089340efae1e54b95508889fd7945033ab97be027e9c6f47f4959
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://midufefew.ru/aws?utm_term=what+is+a+house+tree+person+test PDF link annotation
    • http://fakixigulidol.mywebcommunity.org/how_to_scan_with_samsung_scx-3405w.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/reicast_dreamcast_emulator_apkqlfla.pdfIn PDF document text
    • http://zumbayuliya.online/list_of_conjunction_words_in_english_grammarp40jg.pdfIn PDF document text
    • http://nakozek.mypressonline.com/nirvana_shatakam_meaning_in_kannada.pdfIn PDF document text
    • http://vir-tus.com/xaxitent6mnr.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/33616796468.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/tom_apostol_analytic_number_theory.pdfIn PDF document text
    • http://wbigs.space/how_to_clean_glass_cooktop_naturallyf3i9l.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/kezemiradigu/mefatex.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/wufixeweve.pdfIn PDF document text
    • http://raxajabidadida.onlinewebshop.net/kadusexevukofela.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/65400567122.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/9767470086.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/2871461633.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_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 4888 bytes
SHA-256: 84688256a9e68cdeca428d0ca7a774070b946140e243d56f62bf97451ee8ddcc
font_01_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 11228 bytes
SHA-256: af55a4fd64576fb543ad729d83612c15fd84cfc6590d688d1da610806e72c072