Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa1162c7c83a7a9…

MALICIOUS

PDF

85.2 KB Created: 2021-09-10 01:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ccf0df8436cc9112da42580f9cdadfe0 SHA-1: b2a1f2e6ee38fc5b7468906418c92cd0bd9577bb SHA-256: 3aa1162c7c83a7a930d1e331859495a337b103ecb15b9d379891112c4b28baca
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 0.9956

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://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/wofazidanovuvawutefun.pdf In PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/bukilikewokezebinupas.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/22041031681.pdfIn PDF document text
    • http://floramarble.com/uploads/supetarukazaxamosig.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/gafenoxuzademudu.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/wuxam.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613300930d225---12170397010.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/21732174797.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/11586289264.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/kokulududiw.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/xibofi.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/4846202901.pdfIn PDF document text
    • http://esistore.com/userfiles/file/vupakuwuvovowo.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/sasalaxozafig.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/bunosezuw.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/bevukusabuvefajejon.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/pegulaxakumurisetofivo.pdfIn PDF document text
    • http://willbramephotography.com/lavavodimewonekabaruw.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/19687671740.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/59382728837.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/fugoladoxo.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/wosofer.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210910_E297AC929CEACC90.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=add+free+gallery+app+for+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_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001037d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 10500 bytes
SHA-256: b694234564ba28c6aa3f7d9ff0157633815a894634758ffc7b115bef77bf9bd7
font_02_sfnt_off00011b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 17216 bytes
SHA-256: 3413bed804c5808dc067cd65efc3af891c907825a3f50217c1ad9f38b46ede13

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