Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee24bac548fbf94b…

MALICIOUS

PDF

83.6 KB Created: 2021-10-06 21:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b825351f5917559ee30721995d722187 SHA-1: 3564baab8c516cba908410a6e328f0ac9cdea3f9 SHA-256: ee24bac548fbf94bb7506af9bb789d7698212fe6b69683bac8180b634477c2f2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF also functions as a link farm, with numerous external URIs pointing to potentially compromised or malicious domains, indicating a likely phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://smartcrm.cloud/upload/files/49314571639.pdf In PDF document text
    • http://jinwoosmc.com/userfiles/file/22249402694.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/pebuki.pdfIn PDF document text
    • http://xinnethk.com/userfiles/file/93626032613.pdfIn PDF document text
    • https://btegypt.com/file/rirumanuteze.pdfIn PDF document text
    • http://esistore.be/userfiles/file/83309803968.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/rikuxik.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/difuvukudugizukebofulazop.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/46560369071.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/vofunumadob.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/82388572285.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/xuvorivitiw.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/90616043805.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/felarofabewa.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/tixilidisuxakizeluzidez.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/50097604045.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/padafolomi.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/gorefuvesiko.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/pibon.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/fipibomijabifuxabesa.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/95800725614b81df5c936.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/bojosofewipiresavejediz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wall+e+questions+and+answersPDF 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_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 17548 bytes
SHA-256: f2e7a557dac8504d5f4059b018309ba12b951355fd3e91a8158c19cc3a42708c
font_01_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 10568 bytes
SHA-256: 7e4dc1a761f5f9e127be7019d1a064a3be9e9a708880f21d57bc0dfa81fcb926
font_02_sfnt_off000128cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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