Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0886ce7471424aa…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 07:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9552524a499c940ae9fdeeb04b8ef12d SHA-1: 8fa20cc9989e754bfd992ef1acc4bd4fa2107b29 SHA-256: e0886ce7471424aac7a381bdfb141464354eeede6fabfee691ab603f25451bcd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination or host multiple phishing/malware lures. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cukierniabrzezinski.pl/www/artizam/fck/file/derivulesufuguxedezoluse.pdf In PDF document text
    • http://bonsite.nl/phpcmsys/file/weredewegudera.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/misekeselonozix.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/78811822085.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/42679673730.pdfIn PDF document text
    • http://vln.nl/files/file/kefawigoxisoliwir.pdfIn PDF document text
    • http://snft.ro/media/file/finonekinifafegota.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/37571415228.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/lulimegebijesodonulek.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c8677a5d---vufekezopasazejiduvowov.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/xamiberevufekajaf.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/15048193398.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/17320040980.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/raxawanagopokixu.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/dadukaxenox.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/34543242017.pdfIn PDF document text
    • https://italvaping.com/file/tajodijumixetonobu.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/movupi.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210905002522.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/40694544845.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/rarusezomojadikobibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+long+can+you+keep+uncooked+chicken+in+refrigeratorPDF 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_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 11112 bytes
SHA-256: 1b3dbcb630f9833260f6740e0ffe03ccef7b4eb6cd0dd5e4b27db932fdf470e0
font_02_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 17292 bytes
SHA-256: 5fd41d0bb13352e1a0b5045b4b0ddeefd051bf6b6e7103c3befd806998e70e61

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