Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6181ab95e89dd9…

MALICIOUS

PDF

90.2 KB Created: 2021-09-20 07:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5912605dee8fe97e148c505a78c70368 SHA-1: 5c8d8a8b643a5cf17fdf07e2a17ea2ce3a56a8eb SHA-256: bf6181ab95e89dd9deaeffa8798ea3c3fe42f64608f558d029fb18524861f59e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, one of which is hosted on disposable infrastructure. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chorland-dining.com/webroot/editor-uploads/files/mumukawimotubezalamuwovap.pdf In PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/88908541204.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109111155538925.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/12565312740.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/31948439759.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/47443342278.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/tepajusidulamelunura.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/digoxiromikenefev.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/51033816672.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9cf45a84a---83198558307.pdfIn PDF document text
    • https://coevent.ru/upload/files/kudesadat.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/vefekoxoranilol.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/botedibemeresujagul.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210917054756_eml2ZWRhYnVqZQ==.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/giralosobufupejafapexa.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/dapotaxatukewom.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/31479380593.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/1863378005.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/zitalefopunelas.pdfIn PDF document text
    • http://stattus.com/assets/file/27983135569.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/dokesu.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/26861559347.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134aebae81ff---17469305286.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/21744288509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+high+society+2018+full+moviePDF 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_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 11356 bytes
SHA-256: 68504a8eb8eeadf7efaaa5707f0129672f0736124c78ec45d288ea5542524270
font_01_sfnt_off0001157c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8E 17672 bytes
SHA-256: 7d4a2a3edc33c26267c74f31c9717ef7c1920419a68c63d59d52cde0fb0a5402