Malicious PDF — malware analysis report

Static analysis result for SHA-256 661276c3aa197562…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 00:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29d6c371957786aab65e9e80b6edcb51 SHA-1: 432c94f52ff270af4edfd0ae17566cd1b2b6770b SHA-256: 661276c3aa19756269e42f8564d6207c3ca75c234bc5c3019c7910f3ba7ef2f2
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 functions as a link farm, containing numerous embedded URLs that likely lead to phishing sites or further malware downloads. The presence of external URIs and the 'link farm' heuristic strongly suggest a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=procedure+of+audio+lingual+method PDF link annotation
    • http://greensketch.in/userfiles/file/89234337865.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/48702980535.pdfIn PDF document text
    • http://sbkf.org/files/files/losigorabuzeve.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/92322517135.pdfIn PDF document text
    • http://chengzechem.com/upload/files/8872972819.pdfIn PDF document text
    • http://nfc.soo.jp/file/56572040816.pdfIn PDF document text
    • http://cudicio.it/images/file/23147450209.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd72b30ed---vugotogizunularererame.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/dowevolamuki.pdfIn PDF document text
    • https://ebooksweb.net/files/file/sivobupeturobajarini.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/19374333734.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/61548068237.pdfIn PDF document text
    • http://zatacorp.com/upload/files/66917602028.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/jolateruxito.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614daf14069a1---doziligegodum.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/19565170671.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/redugegawopufuw.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/74391707276.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/furevowekajozefupavudawa.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/21241400455.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/fosufuxoruziviwim.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/sumijimovibunubadaguzonek.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/13499584608.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_off0000b104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91B 10856 bytes
SHA-256: cb177d63703146a1f68a41b3cca63062830e3b9b7d0439005b3db7f491fec149
font_02_sfnt_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 16136 bytes
SHA-256: 91b7dc79e1fa40971451ccaa21e1319548e0d1fc510eb83fc866771a062f99c6

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