Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb007023a167cc92…

MALICIOUS

PDF

81.7 KB Created: 2021-02-28 21:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 8c6242db4e0fa81cfc3f2e44ce66ba45 SHA-1: 4295aec24a3be0b1e0fd238defeda550aee75b81 SHA-256: bb007023a167cc9253b8e97092e94db21805ee3be25fb40703ceea15503109d3
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a notable one pointing to 'bologen.ru' and another to a Weebly-hosted PDF, suggesting it's part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains keywords related to 'employee checklist template excel', indicating a lure to trick users into opening the document.

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=employee+checklist+template+excel PDF link annotation
    • https://nunugaborunis.weebly.com/uploads/1/3/1/4/131437119/9543967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500667/normal_601b2788c18d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379742/normal_5fcd97941d2df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5fcf968b4b54d.pdfIn PDF document text
    • http://risejesifisem.22web.org/louis_jadot_pouilly_fuisse_2017_tech_sheet.pdfIn PDF document text
    • http://dipazekonowa.mypressonline.com/95448126245.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/information_retrieval_algorithms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376371/normal_600fa925d0592.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sexuvariv.epizy.com/18840293457.pdfIn PDF document text
    • http://rapamed.epizy.com/hain_celestial_annual_report_2017.pdfIn PDF document text
    • http://sojisij.epizy.com/javascript_blob.pdfIn PDF document text
    • http://kefujuvaw.epizy.com/alcatel_go_flip_quick_start_guide_4044v.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/700402706.pdfIn PDF document text
    • http://xegiwofune.rf.gd/after_effects_cs6_free_intro_templates.pdfIn PDF document text
    • http://sixiwojiti.epizy.com/13361215202.pdfIn PDF document text
    • http://vejajideb.epizy.com/sequences_worksheet_year_9.pdfIn PDF document text
    • http://luzeparuzibez.rf.gd/jilizekowo.pdfIn PDF document text
    • http://jowatazurusu.epizy.com/are_breville_blenders_good.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_off000101ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 5268 bytes
SHA-256: 72169739e73eb04fa74761813c6e5ea3aa40c0415f663ca19d5b93338c1c8dbb
font_01_sfnt_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 11200 bytes
SHA-256: 256a57a7da582b239ac6282721dd05f511ed736ab7c19ebac0f2dda31419b9c1

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