Malicious PDF — malware analysis report

Static analysis result for SHA-256 11579439a128adaa…

MALICIOUS

PDF

75.8 KB Created: 2021-05-07 08:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9ad8d3419259ae367d125aeda6e5c233 SHA-1: 2daf898c4d157d9ae6a70c9bf9b0d623b568c4c1 SHA-256: 11579439a128adaaef3070759bd6b9a556cf02b11c76157a98e4d74efbc71b6d
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a primary suspicious URL pointing to `https://pelibifir.ru/strik`. The PDF's structure and the presence of external URIs suggest it's designed to redirect users to potentially malicious content, likely for phishing or to download further malware. No scripts were extracted, but the PDF's nature and URL patterns are indicative of a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=boiling+point+of+ethanoic+acid PDF link annotation
    • http://allwoman.site/279695593983xhaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_6042d2af2f887.pdfIn PDF document text
    • http://erkutungotu.com/pazapilifugutenumez2a5a1.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/pdf_to_word_converter_offline_free_download.pdfIn PDF document text
    • http://guitar.su/build_my_life_piano_sheet_music3kevj.pdfIn PDF document text
    • http://kanabuwebu.22web.org/acs_biochemistry_study_guide.pdfIn PDF document text
    • http://wowogobofomufu.mygamesonline.org/14798247414.pdfIn PDF document text
    • http://richmaya.site/define_invasion_of_privacy_in_medical_termsajvpt.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/bsc_physics_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_606b0f709cc89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393193/normal_5ffbf69ed6c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444630/normal_605f81ee6b210.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/cg_police_recruitment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwuvugu.epizy.com/vosidupapovimekixad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ed6801-eda2-48b3-b895-1d86e4f018ac/the_pilgrims_progress_1678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e90ead-1542-4a80-83f9-822e73575ef6/when_to_remove_britax_infant_insert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d9b195-7a7b-4b07-9deb-75825fbfffe5/shimano_ultegra_di2_operating_instructions.pdfIn PDF document text
    • http://mawokale.myartsonline.com/is_the_hp_stream_laptop_touch_screen.pdfIn PDF document text
    • http://sapovupiz.rf.gd/adobe_converter_printer.pdfIn PDF document text
    • http://tediguku.atwebpages.com/29098421072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932daaea-e96a-4b30-81ac-dc90b862fdc2/the_silence_of_the_lambs_sequel_order.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_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 5192 bytes
SHA-256: 1228eb3a85f195d90347844b6abfdb3d875d39e49961bb7aada7a700eeb3722c
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 10560 bytes
SHA-256: 9c0a6bfebd9088344f947cf7f54fcbc1f5b620bdb95ec6f4d880c5072820e8ff

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