Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6ece5308e5407c…

MALICIOUS

PDF

81.4 KB Created: 2021-03-24 12:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c77e5e1a0fa2c82703864eb5c8d6b003 SHA-1: b2b4a7b9fb2a3855196d4ddb50b47e6498e9edb8 SHA-256: 6f6ece5308e5407c3afb099b4783fca7d8d6fdb046c9971e9428f7044fd51b5d
126 Risk Score

Malware Insights

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

The PDF file contains an external URI pointing to 'zajinet.ru/award?keyword=small+pdf+unlock', suggesting a lure related to unlocking PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to redirect users to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://zajinet.ru/award?keyword=small+pdf+unlock PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487191/normal_60473aff04b34.pdfIn PDF document text
    • https://cdn.sqhk.co/lokijuzim/d1jdBAw/famous_inspirational_motivation_love_daily_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/qwTHkhj/infection_rates_covid_by_state.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_601dbd362226e.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/jJqjfii/rise_of_kingdoms_codes_2020_october.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478378/normal_603f196a2fcf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413975/normal_604bc91825f27.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/WoihWkA/luvovasebuviwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484154/normal_60419bdb66129.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488103/normal_5ff51621632cb.pdfIn PDF document text
    • http://rinujuxen.iblogger.org/gutuforelabijazovabug.pdfIn PDF document text
    • http://zegobudipaju.mywebcommunity.org/mabepodib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462036/normal_5ff76b209e8bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470391/normal_6053c6c38db12.pdfIn PDF document text
    • http://dabedera.mygamesonline.org/fosufin.pdfIn PDF document text
    • https://cdn.sqhk.co/baveninale/8gf0pgf/carolina_panthers_2019_schedule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikituxepori.epizy.com/33289376278.pdfIn PDF document text
    • http://supumigo.epizy.com/wabivikoxuwabetuselupe.pdfIn PDF document text
    • http://poramukuwulaji.epizy.com/gabes.pdfIn PDF document text
    • http://zutadefado.epizy.com/63831567062.pdfIn PDF document text
    • http://zijupowisupol.rf.gd/xotunufiwaforu.pdfIn PDF document text
    • http://zawuzujuw.epizy.com/expense_tracker_template_google_sheets.pdfIn PDF document text
    • http://kojusefum.rf.gd/41234102351.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_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 5196 bytes
SHA-256: 4931285ab44614d2c5a0211b6997ac4e17d95f2b050fa2862517da22242b9548
font_01_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 11264 bytes
SHA-256: 57c347e65e581daf9a770a6c703944b260390a230556b2ea0d2694be8014bd10

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