Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff4ab96f6fd3ee2…

MALICIOUS

PDF

71.2 KB Created: 2021-09-10 04:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e18c94625aebd3478180916c364e292b SHA-1: 932e5e6faef5f204a73269a79fe481121f3d6144 SHA-256: 5ff4ab96f6fd3ee275838c55935d659ecda0cec37c85169368dbcdb4665d95e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://caffepontoni.com/uploads/file/87848897721.pdf In PDF document text
    • http://tangneylaw.com/admin/images/file/nabajoxutigujut.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/97003121089.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/mekixutadimirowonutip.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/tatevojoduvufofilufa.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210901120825.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/74411874006.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/tixanigonawod.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/17051948964.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/55522798281.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109012220103840.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/98144267930.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/38850344321.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/lenonebasonubalu.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/mivasoleg.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613941a613cee---vuwenubumig.pdfIn PDF document text
    • http://17njl.com/userfiles/files/5882841045.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/73245076007.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/dejoxanotoka.pdfIn PDF document text
    • https://tekartltd.com/upload/files/57557122091.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/3677309800.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/guwefo.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/jefutifezovodukimadugow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+circle+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3A 15600 bytes
SHA-256: 2aba354483a399fd85dfba0d7e4df9a7dac8127aff6a2a18488d7bbf733ff847
font_01_sfnt_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 10028 bytes
SHA-256: d6160d3b66341843650061bcaf0f841316761cc591a82be761bcd408cb3006cb

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