Malicious PDF — malware analysis report

Static analysis result for SHA-256 f706d7166473bb4d…

MALICIOUS

PDF

69.3 KB Created: 2021-02-16 09:16:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bdf238b157610134b00497204f3a8686 SHA-1: 1cc4a5a2491cd74444b87ba1f3ec8b7f314b5847 SHA-256: f706d7166473bb4d97510c470649f889c939606c99a04eb01e554bbb875da3c0
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics strongly suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/wix?keyword=biology+midterm+exam+answer+key PDF link annotation
    • http://rutefozur.22web.org/what_we_left_behind_book_review.pdfIn PDF document text
    • http://legivupipofu.66ghz.com/tuxenirob.pdfIn PDF document text
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/3ec44f.pdfIn PDF document text
    • https://xasevezivim.weebly.com/uploads/1/3/5/3/135302984/gegap.pdfIn PDF document text
    • https://romasipunup.weebly.com/uploads/1/3/2/6/132681769/fumarusedipeno.pdfIn PDF document text
    • http://tipopajokoti.iblogger.org/functional_resume_template.pdfIn PDF document text
    • https://depularo.weebly.com/uploads/1/3/4/6/134601330/a79f4d6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/71525917597.pdfIn PDF document text
    • http://nulazuwob.rf.gd/33749158626.pdfIn PDF document text
    • http://jojexapopexevof.epizy.com/91355173190.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/sql_server_stored_procedure_formatter_online.pdfIn PDF document text
    • http://fuwuwiri.rf.gd/mopojifituwowenuto.pdfIn PDF document text
    • http://fazomexaboru.rf.gd/bfuhs_bsc_nursing_date_sheet_2018.pdfIn PDF document text
    • http://nefaped.epizy.com/marathi_christian_worship_songs_free.pdfIn PDF document text
    • http://sipariwemarisu.rf.gd/aha_guidelines_hypertension_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/75214609249.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/33988790901.pdfIn PDF document text
    • http://fukibas.epizy.com/9378234106.pdfIn PDF document text
    • http://pakoxerevigere.epizy.com/jekidar.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/chevrolet_spark_2014_manual.pdfIn PDF document text
    • http://letelexedat.epizy.com/zojumopale.pdfIn PDF document text
    • http://bajewilogofiro.epizy.com/battery_saver_for_laptop_free.pdfIn PDF document text
    • http://xamunenefo.rf.gd/39491745898.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_off0000d2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FF 5520 bytes
SHA-256: 06198d83c03e88fa5ae6c50a7d9789c0c69ee1675c33b283aa30b9246fe632ed
font_01_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 10012 bytes
SHA-256: 19fd7a130e68e28314d4eca6db8faf176dd63ccdc9bc23de9a8a71e0999a2273

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