Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6b3042b8283de4…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 18:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: faaa40beba8690ceaacd469fa4f75ef2 SHA-1: 04623190a14825979818454d9abc15b483e86a37 SHA-256: fc6b3042b8283de473ab2d81adfa83a5497e54ef55d036672365e9a4a99f0a34
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://coretry.ru/uplcv?utm_term=super+mario+flash+unblocked+games PDF link annotation
    • http://futureinfashion.com/ckfinder/userfiles/files/vumabosanojegirakiki.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/zalanudolupozejidino.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/4602323025.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/tazusinoguludivufabag.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/64531758529.pdfIn PDF document text
    • http://jsdarvin.com/files/xupaguzaduze.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091216474673499.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/31774821808.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/wirokajezibixopasek.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/78899784804.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/fubidugunalekuduberetod.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/direjutew.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/60276436105.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/74514577436.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/66678669325.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/43934007959.pdfIn PDF document text
    • https://nyig.com/files/file/48192781442.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/vuzepafilesidarujilukuxan.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/97c68dd1bf98bacdd0f7883361afdec8/77889872493.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/visofaribewiniputipe.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/kovivomatuviribatixim.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/limuwatumolezoje.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210908013416.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614018bf7e969---6158776541.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_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 17992 bytes
SHA-256: 5b86fb3eebf54e03e8611652e1f36c356e34915b1b7f2004b2a90c1d51ab36d5
font_01_sfnt_off00010bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBE 11376 bytes
SHA-256: 7ab9017ab2564bd1dd60b9859fc2755f7bf9080c321cd224a4b7569e416b32c9
font_02_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1