Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44b340c82d7cfc6…

MALICIOUS

PDF

76.8 KB Created: 2021-09-10 23:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bfebecad0666b3c7b3a7185d346e2b07 SHA-1: 9892add7863091df247ede22920601b5ab78a5f5 SHA-256: b44b340c82d7cfc668e60b51766e73d9b4eb5f4202fedb62fd599a5a592a7185
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/nejuwatazamuxupur.pdf In PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/55013011394.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/danaza.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/ratogukora.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/refeze.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acec02ca29---velasopajebalexiwozukeri.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/50178031974.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/53065326472.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/zokubititi.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/wowuxazuvedemozupogitij.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/56289588634.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/worinomuwevila.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/75054768835.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/fakimunebijolim.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/69414988986.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/waxojaxiwibaxeremepenig.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/80960876751.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109012109318514.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/31724246903.pdfIn PDF document text
    • https://mimpidia.com/contents/files/bamunijogoduzana.pdfIn PDF document text
    • http://test-immo.com/file/sivejuzegufumiwovumusamo.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/38304249772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dynamic+layout+in+android+examplePDF 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_off0000c3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B8 18556 bytes
SHA-256: 3897d450a7244cbaba6db2134d893d3f97cb3418ecec33f6ebab2ef85803d7ba
font_01_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 10824 bytes
SHA-256: 5deb62c051428487d5daf4c065ab7c793ae2c71b91e4b6e51f28b6629f877605

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