Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61132a251db87e2…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 05:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4677c809647781fb6bb9da233325abe2 SHA-1: d7a01538fb0528d6673f8f0d81389602b7568a7a SHA-256: c61132a251db87e23792946c5a745bad67d1d85a8579dc409da6b9366dffc254
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, indicating a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely for phishing or malware distribution. No scripts were extracted, but the numerous embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://chcial.ru/uplcv?utm_term=wifi+password+hacker+apk+2021 PDF link annotation
    • http://alacartedesign.de/userfiles/file/mumilidavumorirug.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152410a5cf20---3599584678.pdfIn PDF document text
    • https://j26clean.com/upload/files/tovim.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/dabavo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f6e17eaf5---17883592756.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/pagawowuki.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/58115412683.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/xalimomireku.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/31951730770.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/lekegim.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/veroxelirajabum.pdfIn PDF document text
    • http://belniig.by/public/file/42758134504.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/81428381005.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613f92a1b5b32.pdfIn PDF document text
    • https://casaalu.com/luutru/files/56400720231.pdfIn PDF document text
    • http://consade.com/userfiles/file/virobo.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/10924566699.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/musosobin.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/94345979361.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/70778996428.pdfIn PDF document text
    • http://centrons.com/uploaded/file/77590813461529dfd853b5.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/29878949621.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/96015199484.pdfIn PDF document text
    • http://mylodge-naoshima.com/wuzadubotusegufuwod.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/99561354427.pdfIn PDF document text
    • 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_off0000afcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCC 10932 bytes
SHA-256: bd8c5b1e48173a21dde771b5dbc73bc81656e5c0ae5b5f9e7cecda2e59e6dfeb
font_01_sfnt_off0000c967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC967 15296 bytes
SHA-256: 9f70ee52a0d45f40bac2b8028513b08597d705bf4c287540ae3f25b34d57e36e
font_02_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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