Malicious PDF — malware analysis report

Static analysis result for SHA-256 277a495a96454a19…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 16:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c73a87c2ef1977e986e516089c74938 SHA-1: 2faf988ee70746110c6ad10fe447ea235dbd4dce SHA-256: 277a495a96454a190ad7a5b87ac94ef8286a200352f4016f2d79ebcf065dd71f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious sites.

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://studiogeologicotrilobite.com/userfiles/files/zapepogolenosiga.pdf In PDF document text
    • http://smelawservice.com/file_media/file_image/file/85081636374.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/nilulewiw.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/20959579984.pdfIn PDF document text
    • http://hasyo.net/files/file/nepemobimowovajewami.pdfIn PDF document text
    • http://www.moyekolodin.com/files/33199947384.pdfIn PDF document text
    • http://sartor.ru/upload/files/42355845939.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210904224741.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/votodemijugoxadabanosiwar.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11392552724.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/bejoku.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f90fc2e4e---xebipunafilenoxowad.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/wajojanur.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613988188fcf6---dalumerasore.pdfIn PDF document text
    • http://charivne.info/images/file/37966060160.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/wulomobax.pdfIn PDF document text
    • http://medrea.ru/upload/files/19459938707.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/97375665794.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/nadiwafuzurirop.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/62828480875.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/43302646420.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/44487795796.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/37413534303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=offline+role+playing+game+for+androidPDF 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_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 16664 bytes
SHA-256: 090b0d29cfdd11a1bb3c0e490c81d480e1ed63df53dff45863686d9d92371213
font_02_sfnt_off00013158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13158 10716 bytes
SHA-256: 1200e2a758848a9b3c27fc244a2cb43bb9a5bd53331e4d376292f1e9101930fa

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