Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab281788d02f8bab…

MALICIOUS

PDF

72.1 KB Created: 2021-09-10 11:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4bdeece3b5d8dce5b1712880e16adf17 SHA-1: cc3a01a169467016d369b7d4e699ab079f413ee9 SHA-256: ab281788d02f8babdefa329fc2c44888f04c8a4ae04b18f14c6c0e888b724559
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 0.9971

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://rheinfurth.de/userfiles/file/76466545277.pdf In PDF document text
    • https://incoyun.com/calisma2/files/uploads/40808361651.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/guzovopi.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/94280355181.pdfIn PDF document text
    • http://kd-council.com/upfile/files/ranijokufagifugoga.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/fatufuvepuparujam.pdfIn PDF document text
    • http://saktigroup.in/uploads/91323768166.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/mudinami.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/zonorofogedemulisodeg.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/sadoniminumulibebamidux.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/faruwojuruxawejorixavudu.pdfIn PDF document text
    • http://packturf.fr/files/jawovedumamo.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/16238446667.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/86841790869.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/lojidalesiwisevetoki.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210910131314.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/40b25bfdee450c43802806bdc2291c5f/varukifonewilofo.pdfIn PDF document text
    • http://domplus.su/userfiles/files/57159347914.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/tabeno.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/tozelenemuzob.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/54513127610.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/paviwepelo.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/raraxinaxig.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16138eacde96e1---14000202736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fifty+shades+freed+123PDF 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_off0000b8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AE 16208 bytes
SHA-256: 28d15dee6901990ff5d64554672f9eaade411a0fa732663dcbc42e25fce53ec2
font_01_sfnt_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 10616 bytes
SHA-256: 39ad63c7a3f68ece45c91fddf73df66617b4d620f24113cc2d6e51d2cecf6ed6

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