Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfec1e1a6fe4090e…

MALICIOUS

PDF

77.6 KB Created: 2021-02-06 21:13:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0c7a6a011af6bbb9355251b4715660f5 SHA-1: b46d95d97c2494b1468e7361478a14de8e755b33 SHA-256: bfec1e1a6fe4090eccc0615b2d29a556bbd30aad55c99cf9bf1ad2a80dd0b7f0
134 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URIs, including one pointing to 'druttle.ru', suggesting it's part of a link farm designed to redirect users. The presence of urgency language further supports a phishing pretext. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to deliver a malicious payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://druttle.ru/123?utm_term=women%2527s+arctic+parka+ii+canada PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470962/normal_5fec3b09d83cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_6015221531490.pdfIn PDF document text
    • https://pegufozexak.weebly.com/uploads/1/3/5/3/135317465/mixewufilig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387938/normal_5fe154ab8e245.pdfIn PDF document text
    • https://gepadera.weebly.com/uploads/1/3/0/7/130740344/wilam_mizelakazif_pumaluxawunaxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489241/normal_5ff497a06abc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_5fd797d15bce8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_5fd3afb25733d.pdfIn PDF document text
    • https://pabifiliponisod.weebly.com/uploads/1/3/4/3/134367040/4853418.pdfIn PDF document text
    • https://kubududowu.weebly.com/uploads/1/3/5/3/135349078/81f9de5abc21a9.pdfIn PDF document text
    • https://tasiwusod.weebly.com/uploads/1/3/5/3/135351817/jusopipob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gajedimigifupet.epizy.com/imca_guidelines_for_dynamic_positioning.pdfIn PDF document text
    • http://bulujulu.rf.gd/jebugarubepejojo.pdfIn PDF document text
    • http://jominata.rf.gd/business_flyer_templates_indesign.pdfIn PDF document text
    • http://tufubumokagefe.rf.gd/lalugepula.pdfIn PDF document text
    • http://nulabede.epizy.com/de_broglie_equation_worksheet.pdfIn PDF document text
    • http://suwifubol.epizy.com/btc_first_semester_date_sheet_2019.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_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 5296 bytes
SHA-256: 4d985066f59118b31f657938500c2e638311a92018406386bb2bc2f1eb5aa2ae
font_01_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 11928 bytes
SHA-256: 8e25456fa97f3c1e33b6b58a016f56a063a70aa95b2e6fdc695ffa74c03a7ca2

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