Malicious PDF — malware analysis report

Static analysis result for SHA-256 5412c2cd975f53fc…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 15:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d1ce5fcefb41fd8050609c74a83c5b3 SHA-1: 681255d77bbbeb596ecf054d7b557db6a0c7a4bc SHA-256: 5412c2cd975f53fc27405bde50892c2ba29a8e2360ef7622293e82d1c0e64c5d
126 Risk Score

Malware Insights

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

The PDF document contains a high number of external links, with many pointing to suspicious domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous distinct hosts and the 'utm_term_redirector=True' flag in one URL further support its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://arichaindia.com/userfiles/file/notasutedenujemi.pdf In PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/93137838711.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161385caba71b0---fasumalem.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/22237311665.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161313829c3bae---18727765833.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/bikakidiri.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/80588388399.pdfIn PDF document text
    • http://nemalipics.com/21714219419.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/zopewiver.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210908_EFB657029A404061.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/55801139869.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/94561984457.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/ripumuwigifovogoj.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/81432677177.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/jinevani.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/64922335306.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911002231660953.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/82290609448.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/88140625272.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/64773048080.pdfIn PDF document text
    • https://lordoptika.hu/files/files/45436885091.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/75944377332.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/17793130756.pdfIn PDF document text
    • http://kristaldicarlo.com/userfiles/file/rufivokowomarimajijesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=zarchiver+donate+bluePDF 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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 17340 bytes
SHA-256: 5f21e5fe5f377e63bd21a1ed779fe85855deb9bd55a32080f6d42ac49cc1f3f1
font_01_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 10568 bytes
SHA-256: 5170a2394cace054052ecdd8c80ae36c42f97f522825f02b49716e0fd309b437

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