Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe12a67b5582c4e7…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 01:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e98166bd1252fe6efacca7fc0f6ebc09 SHA-1: ccf3975719a2aa15e79eb46b1e5f4472ea4d33cd SHA-256: fe12a67b5582c4e73cc0d098fa412981697013f588a0f2cb5727e02572022cca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, identified by the PDF_JS heuristic, which is likely responsible for redirecting the user to external URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates that the sample is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://avukat.kocgrafik.net/upload/files/rojalelufegipogovonem.pdf In PDF document text
    • http://citty.org/images/uploads/file/90321506953.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/83274877199.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/89313808371.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/67362990616.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615631ef89fd0---90574630849.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/tijubawavimovelet.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-6/20210906194816832875.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/19436891454.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/30088707337.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/mijobotokoxowabe.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/52987823964.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/14354151067.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/dojado.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43332975863.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/6531592617.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/jupebosufitavemuri.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/58891319306.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/sobinatatimibemibexujo.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/lukowanavuwinonebugu.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/51824608568.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1b9b653fdd294eac63307aa7a5bea38f/90358906017.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/dajabadanen.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/xalixidegur.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/gavotu.pdfIn PDF document text
    • http://roocenter.ru/upload/file/55925667767.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/mejokiwilivovuwimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=real+housewives+of+new+york+project+free+tvPDF 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_off0000b57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57C 14604 bytes
SHA-256: 8df1b37f9505ece3ae6e26c5697143373d921490738eabeb5aef003dee93fbcf
font_01_sfnt_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 11212 bytes
SHA-256: 960ba2e73ceefbdd8726cb8fcd03e0a780945cdf7575c937867c766919f8e353
font_02_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1