Malicious PDF — malware analysis report

Static analysis result for SHA-256 a240d8318db8a7cf…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 05:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da2cc79f4e0bb290aa698fc0db60a017 SHA-1: 26ed034b5b9a5026eee605bc794742d39db73352 SHA-256: a240d8318db8a7cf1249dee01c7d4f4fd24253d87dc6beea0692dfae4badf69a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to exploit users through malicious links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gdfsztal.com/uploadfile/files/41435063709.pdf In PDF document text
    • http://cuacuongiare.vn/upload/files/zuwovasusagifileganawiko.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/18650145879.pdfIn PDF document text
    • https://insp.biz/img/file/68464222289.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///taraduguworupon.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///melujetofugowoviluz.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/refevikul.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/luxevopararupa.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210917_7B1BEB5B432A5660.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/85238610020.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/xizawekuseveku.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109030606404240.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d943330ba6---wanejesamuzipapupakuleta.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/19612509949.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/98600154843.pdfIn PDF document text
    • http://martonelektro.hu/files/file/xevitagujewuvunajile.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/64567768139.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/99152467392.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210905075615.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90988170154.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/tikisasu.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16982552193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=watch+john+wick+3+online+for+freePDF 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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 18068 bytes
SHA-256: 0d0d3faf94f7f61344ce797fcb6dc232fdc5253e0d4c6e41118e3122171cb3c5
font_02_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 10740 bytes
SHA-256: 61554f45436397ffa11d76ca91caaa1d99cafbf279bc6c33635e5a44653cbe0c

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