Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d727f50da3fa97d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 14:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b76f6bb0b77642686862973e835ce01 SHA-1: 78732f224b18c5f85ebc4ccae3d6c01531849266 SHA-256: 2d727f50da3fa97dfec7cb9d7a7b00cdd02849b0a0d595aa195c526070e2841a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or a distribution point for further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware delivery mechanism, likely involving embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chickendaylacrescenta.com/uploads/files/35666624785.pdf In PDF document text
    • http://hamdannepal.com/userfiles/file/87541872180.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/fedugaxo.pdfIn PDF document text
    • https://limsurdua.com/contents/files/gikezutelapidubego.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/pisulozetiwerizux.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/25936556038.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/dusisiwuwugogopol.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210901140008.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/65545019479.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/25064609291.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/piradabikovuxikagewi.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/82147572471.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393dd189c3d---26648721753.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/74519019944.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/kifez.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e6cedb60f---sewunigasajomi.pdfIn PDF document text
    • https://ka-base.no/images_content/file/15033633991.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/bezubu.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/rusadoxilejadegu.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/99597395919.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/xoperoguxiva.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/gifasivexewenere.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/34188212086.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/xezetumanapaponulodimewe.pdfIn PDF document text
    • https://stormester.no/files/file/17185768053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+music+daw+for+androidPDF 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_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 17844 bytes
SHA-256: 2edb1a5f102d6c236acb2a623a865666652dc1da645a17e492b00a304b5b6fa2
font_01_sfnt_off00010e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9D 10828 bytes
SHA-256: 2937ac327d91b807f94cc8700467c0db8a0fdb17d4ef86839b66faf596d54aa4
font_02_sfnt_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1