Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be5e96daf7328d1…

MALICIOUS

PDF

71.0 KB Created: 2021-09-17 17:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ff881daa116f527c25489ccb502f9f1 SHA-1: 665236150619d8312fa4e02437812432791e5ebb SHA-256: 3be5e96daf7328d1bf3eeb39149a39d131de2bb9fc4810f58b8eca17d4f3441e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a non-clustered link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dianacb.cz/userfiles/file/lulavaxiloxotuz.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/kalumezizeverax.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/92148718735.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/80339114008.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/rudatevogefofawofafuzo.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/38536583562.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/49765783025.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/rolevinusebiwituxibenupo.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_112644.pdfIn PDF document text
    • https://petikdaun.com/contents/files/80505729242.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/gedofetegolomovoboxulen.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/bivirilo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143861b9abf7---23030665429.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/12539205992.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/popopar.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/tudokasiri.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109011754322648.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/10243397775.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/24291493077.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/18489702538.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109170750513437.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/78285229098.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78173168228.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/33902207375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=codon+to+amino+acid+tablePDF 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_off0000b523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3A 10436 bytes
SHA-256: 34747b81e21f859d4f333dd0a32b48f4229898011e833170bd31ee3bb5451517
font_02_sfnt_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 16476 bytes
SHA-256: 3968253d65929bb04bdb3128df8765670bfc19d8d9786378a41b862d1978cba6

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