Malicious PDF — malware analysis report

Static analysis result for SHA-256 b890537395445afd…

MALICIOUS

PDF

91.2 KB Created: 2021-09-08 21:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1859d45690a9f3eeb2acd8df8ddc494 SHA-1: a25eb79bbaef70f973410afcc912b2486d2a0520 SHA-256: b890537395445afd565935f262274256a00a4c3e9589b7ff89a86a0d9aa50497
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or phishing sites. The presence of multiple disposable hosting links further supports a malicious intent, likely to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agrion.org/upload/fichier/53466630121.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4696387d2e0df26ef0ca95d9ebd83a72/70268096075.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/26961480835.pdfIn PDF document text
    • http://runhouchem.com/upload/files/99495461615.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/bikojakujarazisumoxiza.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/35243069440.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/gurozugagos.pdfIn PDF document text
    • https://superpart.com/files/47407751520.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/kubazebatomabola.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/75844730592.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/pugapuliwasina.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/34652987004.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134504ba4ff7---lukenexewuwakumonowet.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/gijiruniwipel.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/fapan.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/33532764499.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/ralonerozizadixizerid.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/diwifefikevetasalotixega.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/89039383242.pdfIn PDF document text
    • http://trivio.it/userfiles/files/90465479349.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/7923895042.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/93620429263.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/kakajem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=poco+x3+vs+redmi+k20PDF 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_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 10796 bytes
SHA-256: 9c7f2a1a3c08d8fecffbf32b6c407daabda2aad4f0decbf4892ef86166c0ffe2
font_01_sfnt_off0001146d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7F 19716 bytes
SHA-256: 504b6d37b393e94d3cdbe299edac5527c373a6c0665a409cd7143838314ffac5

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