Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a3ab1ddf908af9…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 01:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec06f2a8fc367aac3346a8f723f3b3c7 SHA-1: 480eaea2306526fc0fa5dce0b1ff472920e3b3db SHA-256: b1a3ab1ddf908af92257d720be8eb66bf6246fb369dcd031b7da02341fb485f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a link farm, with numerous external URLs pointing to potentially malicious content. The presence of a 'download button' heuristic further suggests a lure to download a payload. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=mean+median+mode+and+range+escape+room+answers PDF link annotation
    • https://rafaellopezehijo.com/upload/files/dokinofujakop.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/xoxapagudon.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210904_F704098955DB50CD.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/94558638292.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/jinifun.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/zazomegigevezezemexosupa.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/kamixogitoxajozi.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/76202255812.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/loposudedipeponarawisomak.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/27996475325.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/65827027337.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/sejarepunu.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/gosibazilajeluj.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/74888648094.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/bisadev.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/giravutiranotur.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/68623006738.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375a76ba8ad---47669746766.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/nupumijobotife.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b870f454b52a8a69036eb23f3928465d/latavuwurefebi.pdfIn PDF document text
    • http://altinay-law.com/images/file/54781165158.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/pinebawamira.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/panopi.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/63070376108.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/46756842197.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_off0000c7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D9 10792 bytes
SHA-256: 054dcba41016dacdb35ef78c812a364f9c7f95e7621522d3e9c6cfd8895f7512
font_01_sfnt_off0000e076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 17256 bytes
SHA-256: 35bac1a5a503e9a85da25fbeee2f147f71c4f7f760fb6b022ac949dfa6d82397
font_02_sfnt_off00010cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1