Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0a9ad89fa334b2…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 13:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b69a52a09441e45599bd65aec7d3f9e8 SHA-1: 782861ed1ad37e7933d81a0208a86aafb373eae8 SHA-256: ec0a9ad89fa334b20c6a8f9acdc225947b95c51795c6598aab336a1fe83cd116
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to distribute traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cryptobasics.biz/uploads/files/32834042917.pdf In PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/nurekajalafokajaniwosa.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/vaworajurosodujofexaje.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/3916359498.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/48863115708.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/vanovixexenonalikixodoxex.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/kozonapipibunodurobel.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/25542844033.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/44546688834.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/zebef.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/gesujenosa.pdfIn PDF document text
    • http://nincity.de/inline/file/galepamamuzuzebiv.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/86930997982.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/82929673083.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/xoluzizi.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/ponuwa.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe9d28b7a8393fb9ac871ef7e3a66ad6/joxibiduledibiteli.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/winurexu.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210918132929_dw3emc.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/163680436.pdfIn PDF document text
    • http://hk-keber.de/images/file/dawatovetezipodo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/43d2368fd48abfe50a52c80964e32e8d/mofasazeviwigazefowuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=escape+room+games+unblockedPDF 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_off0000ce35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE35 10984 bytes
SHA-256: 452bd3be1e7d6cf610e7b7f5bc79815eb319ec3c5a18dc5040b30d24fbd75bfe
font_01_sfnt_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 18356 bytes
SHA-256: a2572c3129105ba3f12dc7003dcce5fd1a6403071d4acc13618e33fdd6ed24bf
font_02_sfnt_off0001172c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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