Malicious PDF — malware analysis report

Static analysis result for SHA-256 766b9c33b6defbb2…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 18:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4ba58c918b14b3f5157fdf778e4baedc SHA-1: 8fbdfb9d763cc0598f59ba4067b132d68baaba44 SHA-256: 766b9c33b6defbb2429e92ab2f04b3f7c76945b5875da7088c0ee86b6c086802
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://irlanc.ru/uplcv?utm_term=download+free+plants+vs+zombies+unlimited+sun PDF link annotation
    • http://otohondamientay.com/upload/files/labutojajazufaxazob.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/26105638630.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c4c6d63e8abf946c3d868754cf2f435c/46465641737.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/67734182350.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/37174890771.pdfIn PDF document text
    • http://shamayachts.com/upload/file/pemizisiberuwirojovifexo.pdfIn PDF document text
    • http://techbis.pl/files/file/65543975735.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/60528848115.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/sezig.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/pijejubobexebanuxu.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/51702029116.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/42613122901.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/63815652510.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/pebujifowelepasufef.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210903_201011.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/35856350042.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/67585784924.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/nijekatojugez.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/93164616926.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/202017937.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/mibapedebinexufa.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/7350433855.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/gexupixigigid.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/jiruvejedamoz.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://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_off0000c6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 11112 bytes
SHA-256: f069dcc3b639353fc24c889852f9a48bb7da7f03d1fa12c0320dc5bb837766ca
font_02_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 17264 bytes
SHA-256: 6dec4f48cea2eaea8c20817836776f0ab0ca8f258c980d9849952650cd7112f5