Malicious PDF — malware analysis report

Static analysis result for SHA-256 53967a517eb8c57d…

MALICIOUS

PDF

86.7 KB Created: 2021-09-12 00:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7d6f2d14853b04b3f9fc510ece38967 SHA-1: 3e5142def3a185be94774cc52cc947f51606aee2 SHA-256: 53967a517eb8c57d627461f8caa9ee5c4960f8f0c6482362cd7a20fdb6051f9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The presence of 'utm_term_redirector=True' and 'disposable_hosts=0' suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://casavacanzesanvito.eu/userfiles/files/vugiguf.pdf In PDF document text
    • http://littlepearlbooks.in/data/eimages/file/pirejerepovokevepudalijo.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/gavodefivuzedudemoxebazor.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131712b3432d---26711277420.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/xananufamakuwekerabew.pdfIn PDF document text
    • https://terracell.pt/images/file/65371976027.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/fikes.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/mogikikig.pdfIn PDF document text
    • https://tierlistei.ch/downloads/siwutamo.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/zewerimilimexar.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b0e19abb---10904373692.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/88186612000.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/ruzinup.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/tebuva.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/tomibosawaveg.pdfIn PDF document text
    • https://interconformity.ro/images/file/vusilidek.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/fofetisipetune.pdfIn PDF document text
    • http://canoeing.by/pics/files/savew.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/16668071215.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/zugutizevaxu.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/25679374115.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/luzub.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/nisasiduxodum.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090917314928265.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/tabododexuninagaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=rally+rush+2+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 1664 bytes
SHA-256: c737c1571b827a9af515084efd4d135d2c05ce8763284746c5506df3322eddb3
font_02_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 10272 bytes
SHA-256: d0ba1119e311e93504674ea57960f7580907ff520865e3ca2d65709ade6f3e1c
font_03_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 23952 bytes
SHA-256: a7b7c23fc9a238a20f16dac346418d37775b865341e6f7991fdd54acb1938a45