Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77ea95db1590221…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 20:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02ab8d9a6ab6cde7562031476165bbf5 SHA-1: b4f96fb79a75e17d04a1d0be10b590cf904615c5 SHA-256: d77ea95db159022190c82238afb226d2575309782f6fe1db97bad536a569dd18
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The embedded JavaScript likely facilitates the redirection to malicious sites, as evidenced by the numerous external URLs found within the document, many of which are hosted on disposable domains and appear to be part of a link farm. This suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=watch+criminal+minds+online+putlocker PDF link annotation
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/wabiwixofopibegukukaleb.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/88742553935.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210907131801.pdfIn PDF document text
    • https://cmoretv.com/userfiles/silofixefivowal.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/71160466257.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/92579620023.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/10749010312.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210905_185641.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/97640063103.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/56990a1b518f99c2ba092a56e952addc/69768963796.pdfIn PDF document text
    • https://cecprint.com/images/file/nigebifumupabaxemugudeji.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/24394128393.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/gijov.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/gezuzonugutigarakenokumon.pdfIn PDF document text
    • https://nexapos.com/upload/files/40711356259.pdfIn PDF document text
    • http://jainfarms.com/uploads/fitofujobi.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/62319206102.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/29706161674.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3147e449---14065991171.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/12582996816.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/kepupukasedikilelugate.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/kojuseno.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/87221228003.pdfIn PDF document text
    • http://prompol.com/media/file/8916737415.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/gatisipojituludere.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/rakafamavusikuzemewivak.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/97974199118.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/pejanenuv.pdfIn PDF document text
    • 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_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 10964 bytes
SHA-256: f89115050e0d2b0c317575ff22c9ba81eee560482c47cb728ddc6340373277e6
font_01_sfnt_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 17516 bytes
SHA-256: 107528a0706d5dcbfb3d74b19f5112c70859c2a34bdee93a9cb814de3278e576
font_02_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1