Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3cbd0d1bc55f9ce…

MALICIOUS

PDF

86.9 KB Created: 2021-10-13 00:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 409c37f7cf5e10b4dee24e5058782e94 SHA-1: 8409cd6a11af96c860d16de2747519ab4cdd50e5 SHA-256: e3cbd0d1bc55f9ce9df98c1bef9068c1f25c4c96b010d65861ab71f0d25c74e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by multiple heuristics, including a critical ClamAV detection and an ML classifier flagging it as malicious. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further indicates a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://tomekorea.com/userData/board/file/sikumufovewadelukofem.pdf In PDF document text
    • http://tchid.net/userfiles/file/18472276393.pdfIn PDF document text
    • https://ttablaksystem.hu/files/file/sugafonumumig.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/sabatorobux.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021091410205489.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/wekalesewavezabuvomisot.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/21476028686.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/jepupelagegakubemiwebobed.pdfIn PDF document text
    • https://masteranalog.com/userfiles/file/musotebumetowijujadosuja.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/33910962336.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/lilepefap.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/jepasezum.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/kuludidoduluwixitamus.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/89108598079.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021092718150873499.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/91150327063.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/rawojebefiliki.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/gexexukimalusuberiroxazu.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/61486802399.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/56531975942.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/dizirumito.pdfIn PDF document text
    • http://marymo.ru/uploads/files/metetuzorarosud.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/47600098700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/xPAns0MRe5M/uplcv?utm_term=the+lost+child+extra+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_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 18544 bytes
SHA-256: a6c038210a746fcf8a9aa64bf059d5fb1758bb0b66498950cfc73f6f2d96ecb8
font_01_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 10864 bytes
SHA-256: d7cffa417f53ae206cbbe256974adc948b0921f250414f1694a07c34def17e9b
font_02_sfnt_off00013561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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