Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5683b1881e2afe…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 22:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2115b21056fbc9a8e297f1c50255c02 SHA-1: df82c19c293be3c5c86fc445791a4f1a8360a81a SHA-256: bb5683b1881e2afecd108b829f7ff2cb7096dbb9377138bbe6489622aae59a39
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of a link farm suggests an attempt to obscure the ultimate destination or host a large number of malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lovec.bg/root/ckfinder/userfiles/files/nesetukekum.pdf In PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/19240807562.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448e969f1b7---12308069990.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/77408221057.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/febemizazolipimedupi.pdfIn PDF document text
    • https://mmtours.si/uploads/musuvuwimoxalajon.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/42017781892.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/viragavaramezetanowij.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/pedisadimopunegifaza.pdfIn PDF document text
    • https://comfort8889.com/upload/files/pijabawidetubujuke.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/33118133792.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/35677500462.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/11722434204.pdfIn PDF document text
    • https://gulamanis.com/contents/files/fubakatafaritunoduwi.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/3946647349.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/degoxatujelujetuno.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/5422875068.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/nujafutidamipiji.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/77283418999.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/25883269491.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/medalovel.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161469ea07d1b1---58852185838.pdfIn PDF document text
    • http://eko-uklid.com/files/file/69866779001.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/puwokenamira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=jack+frost+game+frivPDF 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_off0000d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 17216 bytes
SHA-256: 0e260725d462c1d2202607b1e1bf28856fafb4f120189d20cdf78cb878c87188
font_02_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 10680 bytes
SHA-256: 5ed4b59bb5c2fc3314f33c82b3ac929f5f9f5998288cdaf190b17d9c1a02659f