Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a76f51aeeb50f4b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 13:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72b7eccd907b83a967493cf08effe49b SHA-1: 0253524244b9acce8b673d6165e379fb628f327f SHA-256: 0a76f51aeeb50f4bc05b7c35a66d1d166124496f8b49909c23ef97037c7db563
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded links pointing to various domains, many of which are likely disposable, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination of these links, which is a common tactic for phishing or malware distribution.

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://davaocarrental.com/images/file/levotefomovomuf.pdf In PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/95351858399.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/65986379941.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/19011070749.pdfIn PDF document text
    • http://sb-78.ru/files/file/kejeze.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/nowupipagoxokiwovuzoxafef.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136d34dbc767---pinenexotog.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/55045049521.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/danula.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/16314510995.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/23506593072.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/puwajasodet.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/69441756717.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/wazobela.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/lewexudisub.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/bopoxopemafatofuzezije.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/sotewifibomidoji.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1153299662613f4d5168bf4.pdfIn PDF document text
    • http://iucecb.com/files/file/32985724118.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/63476036167.pdfIn PDF document text
    • https://dukupahit.com/contents/files/452987558.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161415434cb513---82935772361.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/bemimamozawe.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16132f67b2f11b---kobasumetukag.pdfIn PDF document text
    • http://thepducphat.com/upload/files/mawegolekato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=top+10+largest+countries+by+areaPDF 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_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 11040 bytes
SHA-256: 6a187259b8e61759acd3d4932fb0ce87b7276a57adce83ae9faae04d6e8ba012
font_01_sfnt_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 17872 bytes
SHA-256: ccf769b400b8e8c3bf5920231c7a4fc10bea9167aa18b6a7f935944a84c121f0
font_02_sfnt_off00012a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1