Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e37c82d8091139…

MALICIOUS

PDF

93.5 KB Created: 2021-09-11 18:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: dc43f49e87e0c93901f3f4c5482e1f33 SHA-1: ac9bf1edfbe63d43730683a89d84829969e7b53a SHA-256: f4e37c82d80911399a69e55398c56593c749f0c43b9c0803688fc158d0451a06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://lukasikgroup.pl/Image/files/vobage.pdf In PDF document text
    • http://wsmr.us/userfiles/file/82918459331.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/kudufagux.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/62139934778.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/mefufazitijaruf.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/47862328585.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/wavurojizu.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/mutiriwasupenumojekukov.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/zitinomaved.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/3577871789.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/laresuxajeregefu.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/xepuw.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/fopilewineb.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/19390194040.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/muxakabepowekobufi.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/87429102337.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210907/file/63264569887.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161394070a0a4f---32690944289.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/77002732787.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///jijizagureniverurefefawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+popup+window+show+at+locationPDF 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_off000105d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 10644 bytes
SHA-256: 4c647164fd7f2e4614287b548dd9bac1bcbd193b30087117414b1715e4b79b4b
font_02_sfnt_off00013651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13651 18960 bytes
SHA-256: c7397b4dddf54b03efd270a3d812ce6bcb648588d4c028eb00e4293b693e713a

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