Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a90f5d9751cbfb…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 19:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d70601b201a26bbdb7f052cdcccb63ee SHA-1: ebe21c15320ae65703f87f91d6002318830bcf84 SHA-256: 56a90f5d9751cbfbcec87cd0785492d48c87227fd973a6179170b2f0b5984f69
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 0.9977

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=auto+call+recorder+apk PDF link annotation
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/70717326126.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1869528588.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388647b490f---ladokewakumufokipupeko.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-6/20210906072804806374.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/gunitoxagaga.pdfIn PDF document text
    • http://seritour.com/rsm/files/bilegikeruxamivekunawomos.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/53075687215.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136050b3837e---45747771338.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/78190163097.pdfIn PDF document text
    • https://fasaac.org/temp/files/kalarejow.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/79164870313.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109080458188230.pdfIn PDF document text
    • http://teresachild.com/upload/files/7452940008.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/ratedo.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/29894585057.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/43760026694.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pumimomovuxegufuf.pdfIn PDF document text
    • http://skncn.com/u/files/tujapa.pdfIn PDF document text
    • https://melz-feu.ru/upload/73088427130.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/lojojavix.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/77344117590.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/89583585961.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/57192116126.pdfIn PDF document text
    • 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_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 10316 bytes
SHA-256: 27e23c252845c605754b2616f8377e6ab545fc6778bd38e8e96246123d03a16b
font_02_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 18456 bytes
SHA-256: 0468acb2989d8ff32a0e65329ad5d183bba698691ea24e61dcc8c6f593b113d7

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