Malicious PDF — malware analysis report

Static analysis result for SHA-256 5153e414fa7a6e41…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 21:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f0dd08683a7b96327f915dd3fcebc62 SHA-1: 1322451b5a460bb6047c9f9163b6d70077698ae2 SHA-256: 5153e414fa7a6e419eae6249f99695934ed5f4fc66fbfe53d7d7d6949f05b3a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the structure and numerous links point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://reicar.dk/userfiles/file/89557482444.pdf In PDF document text
    • https://sicurezzaips.it/uploads/file/sejazerojekesi.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/zojekewepa.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/jeruvipusosal.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/merado.pdfIn PDF document text
    • http://partnercable.hu/files/letigisojelajipolobiga.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/juzasimoter.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/48345645399.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/10136060911.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/45816757932.pdfIn PDF document text
    • https://argumentua.com/i/file/fejoxanerakuwivunevalitur.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_112644.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/roneladutow.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/95933537730.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/faxebuzigox.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/luwosokewaleg.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/tibomogu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd3284391f---xevarewozebet.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/24183480988.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b32c262f---71481821555.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/zijumakekuwarisobip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=watch+guardians+of+the+galaxy+vol+2+freePDF 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_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 11252 bytes
SHA-256: e72cea1433d0c2850222827b326c50e8db225a8aa106b978d6385acac4339250
font_01_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 17984 bytes
SHA-256: d0a4aefb49850c3ba7650487c24446ca6812b8b01b208f0f9143e32b5d5d5a66
font_02_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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