Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c59f38825b202a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 11:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8bdf746cbb5f49bef792849ce547c5a7 SHA-1: cb475d46809e79b888c6c8cceb92723842baf1c7 SHA-256: 30c59f38825b202a8a2733845d7c22b3f7eee859dbc724b12a12b4ba2d942118
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, containing numerous external URIs pointing to various domains, likely to obfuscate malicious destinations. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/bamumubapijitix.pdf In PDF document text
    • https://astdubai.co/userfiles/files/nixiluxusawewematowuroka.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/5290275806.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/xaxaxufa.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/ligigotefaxebor.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/13127831370.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/jetitemifanomezerifaxit.pdfIn PDF document text
    • https://podimercrm.com/img/files/pifagisesagotatiza.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/41789817978.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/63486908763.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/redo6nd0tjlomnj66afcmglc8g/jejikizuguzufe.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/68504360279.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/26118403690.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10574622426.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/61347374440.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/11446999915.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/96929783071.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/19442809457.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/xanixaxofatixijetitez.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/75729014676.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/suniwo.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/fakave.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/deratetabe.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/9996026806.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109151019464586.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c723d9f90---pibalaxiwowewamerovosera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gta+sa+pc+litePDF 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_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 10080 bytes
SHA-256: 620309a214193d2b3964ccc9c24bdf5751253f5e70beffca15ecf5256360cbdf
font_02_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 19260 bytes
SHA-256: 0247000d7c4e1cd15690fa5e1397fe83304fa2d4464690580aaf31b823bdd7a2