Malicious PDF — malware analysis report

Static analysis result for SHA-256 868644113f721f55…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 11:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e37c8956b189fbd296426c48148e28fa SHA-1: ecf306cdeca82b7346ec8d7ce6c30d683152e264 SHA-256: 868644113f721f55aec491ef74d87ac68f40a095d8937335073fd69504461918
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for phishing or distributing further malware. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=how+to+check+screen+time+usage+on+android', further support this, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=how+to+check+screen+time+usage+on+android PDF link annotation
    • http://villahetzwartepaard.nl/survey/userfiles/files/34103862741.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16148a9c332e39---97106896884.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a20a1d3648---91968680596.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/muwanimawedokorifigi.pdfIn PDF document text
    • http://oilspecchem.com/files/56640971018.pdfIn PDF document text
    • http://jucal.es/images/file/6035153961.pdfIn PDF document text
    • http://rentaruedas.com/files/others/xedojakaxiputomujadado.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/jesisazizutoxitoti.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/vosonowipajom.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/niraxuximawumejeborad.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/wafulojiligenupodoxo.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/selipenuparijidelipa.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/vamelazenepilega.pdfIn PDF document text
    • http://medi-sen.com/files/files/xotuzodapinagav.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/68558094180.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/73404850906.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/97205191621.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/33402283083.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/fajovebedumewiruvavaw.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/xizamoxixesef.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/72637877923.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/mijuvokulipemevojigaxelo.pdfIn PDF document text
    • http://dr-temt.ru/images/file/3586096847.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/fobunodezujofet.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_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 18152 bytes
SHA-256: ae81411ce44f071b1831b9ea3a3068ecd77db8014a6039227b5bc21328f6ad89
font_01_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 11040 bytes
SHA-256: bfea21d63af720d29b954525e3ecbc0c8a28cf4b32bdfd572ea12e61705dd97f

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