Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa969e947c5026b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 04:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 81175af91167aacbfb811c0c0dc56d8f SHA-1: c66869afd68a584f86ae221216645c64c0dd0343 SHA-256: 8fa969e947c5026b62a36630adbd74a14ba42b0b8bb5513cf8d61415c55248db
134 Risk Score

Malware Insights

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

The file was detected as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to PDF files hosted on various domains, suggests a link farm or distribution mechanism. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83d6c0381---78451040865.pdf In PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/zegafifusoxofetiju.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/ropoli.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/rifutagixonewugumozupenop.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161378925a42d7---zejufekigejukigu.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/49304976503.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/89036669618.pdfIn PDF document text
    • http://mcutech.net/files/wonomobovape.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/45150746476.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/86129988421.pdfIn PDF document text
    • http://xsteelstock.com/d/files/bawuziluxubebetamaveme.pdfIn PDF document text
    • http://gekon.net/userfiles/file/vebasep.pdfIn PDF document text
    • http://93564497.com/userfiles/63642022592.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210917_047DCA6A6E2CFE6F.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/kusunezoruzuw.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/xalimomireku.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/12608986731.pdfIn PDF document text
    • http://philipsphotographystudio.com/namimepekugiw.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/sagelugufekaneketolame.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/76004872894.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/54304920318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=az+recorder+apk+modPDF 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_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 20268 bytes
SHA-256: 4f6859373812731eb06bd511e38e5b19afa80aefb31f98eacd797633b442afea
font_01_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001250e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 10300 bytes
SHA-256: 9394b7524ab5f36a3c0ad96b5a5d12e133e4c2ef81e05caa3e92fd2a858649c6

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