Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8f808c1ebcf86e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 18:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 921e27becdcd97b79954ce1b9d9206c8 SHA-1: 1248ebc1d2012bd1ba3f68ab24fc97ed9824c332 SHA-256: db8f808c1ebcf86ecae9b1058c09d3da07d60ead9c1e0f87a43444ec1c97189b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a link farm or redirection mechanism to host malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baoholaodong24.com/userfiles/file/62930029122.pdf In PDF document text
    • https://letajicikoberce.cz/userfiles/file/bijitafedazo.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/kulewakabosebejajakerizex.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/powusojuzejiwupedukuko.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/gogapu.pdfIn PDF document text
    • http://schokofontaenen.de/idata/83652704931.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210901051133.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/38995708247.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/96359476042.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/jizikutiwujodaxale.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/25445768823.pdfIn PDF document text
    • http://contelex.it/userfiles/files/25340872742.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/mimatolazibope.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/45030926696.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/vetiki.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388a2932378---tupidigefumetolilu.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/7634020282.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/bomolut.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ca7c50381---povokafipefekigawumevedas.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/67927476261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+contract+stella+gray+read+onlinePDF 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_off0000d3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 10724 bytes
SHA-256: 476f50cb8d3fae2f5216c9a44cf8253875b83e916db61ead960e85d74ef2e1bd
font_02_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 17380 bytes
SHA-256: 00df124381b20dfff1c8697db60c0dd940c6b67fd059b28b96db332eca2e35aa

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