Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92457b7ebc4c423…

MALICIOUS

PDF

74.5 KB Created: 2021-04-03 10:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5328af28e14ab6d0bb58992e6c84332a SHA-1: ceedb3976e02b93b06659b4108bd77597912cdf0 SHA-256: f92457b7ebc4c423d2ee4c263cd9693c7f65020c256fd663daba048e94403f18
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 that redirect to malicious infrastructure, specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=viper+car+alarm+7756v+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485689/normal_60464644be626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463810/normal_6043112534127.pdfIn PDF document text
    • http://fexuvukenix.22web.org/polk_psw505_specifications.pdfIn PDF document text
    • http://bajexubazewa.iblogger.org/is_hamilton_beach_a_good_toaster_oven.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_6019ca0a3193e.pdfIn PDF document text
    • http://duwojex.iblogger.org/what_is_a_seasonal_job_at_home_depot.pdfIn PDF document text
    • http://josogub.iblogger.org/65888485546.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415292/normal_5fca2d56e2405.pdfIn PDF document text
    • http://meribikuje.22web.org/technical_analysis_currency_market.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_5fd9450a054b6.pdfIn PDF document text
    • http://nogivubuleduwi.22web.org/gosezamuxuvaxezukakujef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_60597ba257b8e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zovameden.rf.gd/52465892794.pdfIn PDF document text
    • http://wemazepiba.epizy.com/agnus_dei_sheet_music_violin.pdfIn PDF document text
    • http://kepujelibip.epizy.com/derorevowadaki.pdfIn PDF document text
    • http://tumofif.rf.gd/btec_level_3_subsidiary_diploma_performing_arts.pdfIn PDF document text
    • http://fuvarob.epizy.com/nizivokake.pdfIn PDF document text
    • http://bategozejaxa.rf.gd/coleman_furnace_ignitor_not_glowing.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_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 5284 bytes
SHA-256: d6ee895fb3e54974bc08474cb746b87a75538cf9552563c90b6d38fc0d98b87f
font_01_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 10252 bytes
SHA-256: 8b271d599c6cf416493c9fa4f72b07ce196e6c588566eddb029b430bf6ba0342

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