Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f15b472180ccc5…

MALICIOUS

PDF

70.3 KB Created: 2021-09-15 23:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b7f8099360e943e2d5a13003ecbbc315 SHA-1: 80f49b0daf22099f0e4103f76a4e28547f3f0bfc SHA-256: 50f15b472180ccc54d2fcff2817cb15a00af606abaab1cb68b34bb770e094a84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosts, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to direct users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://forexinc.ca/upload/editor/file/84422280603.pdf In PDF document text
    • http://medeeatour.ro/mm/file/gekosepijuxuziralupikurax.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/lexekisogofimadiwidodi.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/15929643160.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/runalovelewupomomafuxidon.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/merutozamomirixijezew.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2ca02514f---jajejagasavadokujofok.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/95306394924.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/39722899540.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/24308321897.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/deluv.pdfIn PDF document text
    • http://k1a.ru/images/files/file/63873890800.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/55413852868.pdfIn PDF document text
    • http://techbis.pl/files/file/41730438339.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/milawoxelifupagezewif.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/bakozik.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210916_021848.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090622575428212.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/96576076632.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/92123226871.pdfIn PDF document text
    • http://104408017.linker.tw/files/37456055569.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d8e27188ff249710cc944a709415a256/suzelatixopetojezovute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=redmi+note+9+pro+5g+philippines+pricePDF 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_off0000afd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD9 16576 bytes
SHA-256: bde75555c99243003557fa161c173564ef615e741d9d84cc0cd98d3fdedbd1a8
font_01_sfnt_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 11144 bytes
SHA-256: 27454331e5628f0bee08b0fa0680e0a987ef1e2833534e80dcb78a0bdc313071
font_02_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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