Malicious PDF — malware analysis report

Static analysis result for SHA-256 264e2b6d49bc5f81…

MALICIOUS

PDF

88.9 KB Created: 2021-09-10 11:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d3a20188a77930b454efaf959a22c1f SHA-1: ced5a9e1718e2af21273ed51fbce38e0f01a318f SHA-256: 264e2b6d49bc5f81562b1d056c0b4c8fa305b85aa39cfdfd400aa60daa059ea4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. ClamAV and ML classifiers flagged the PDF as malicious, specifically as a phishing trojan. The presence of a link farm suggests an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://perlawarmii.pl/userfiles/file/13402198318.pdf In PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/mejavatew.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210906215513.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/73071529404.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/zovujoxuvigimal.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/68621363318.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/10353334514.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/72755086448.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-4/20210904094404972886.pdfIn PDF document text
    • http://teresachild.com/upload/files/jexejapowerogof.pdfIn PDF document text
    • http://ruihuitax.com/files/file/19881164485.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/31127927119.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210908221401.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/rulumusuwulosixapuko.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/79516536031.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/13e1aa86cde28f67cb191e8f12adb98c/35416678562.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/58422682660.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/fumajax.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/94727049668.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/75499988088.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/61019897572.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/35066131988.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/jarufataxeranexivijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=use+5ghz+wifi+androidPDF 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_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 19244 bytes
SHA-256: f66f6ccfe1fd15a2faac72e82907f941cdc5fdf186a041e7ef5022800996bf37
font_01_sfnt_off00012565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7C 10776 bytes
SHA-256: 2f48a55f8b89c2bae6d23c4c5385e66a2dd7137d6aeeaf5970a7f14f06ca957c

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