Malicious PDF — malware analysis report

Static analysis result for SHA-256 012ce8c4b95238f1…

MALICIOUS

PDF

86.2 KB Created: 2021-09-13 10:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d06f9bd053973ff72f5c6ac4b4d08b1d SHA-1: f4ab096c567d533fde6b87e495e5b9eb4dc9a389 SHA-256: 012ce8c4b95238f14af0446a1fa51b4d79b52b6355a8cc2d8b39e93af8db9ac4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, including one using a raw IP address. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the intent is to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://ljjxmining.com/uploadfile/file///2021090209204744.pdf In PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/49473379025.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/kedajufugirapif.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/20074330051.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/16274837485.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/kufap.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/muzajamuwab.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/1218859177.pdfPDF link annotation
    • https://resulgame.com/calisma2/files/uploads/29613182559.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/padufofometijeriweradota.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/42063744127.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/peketomidovojaferelin.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/7908802102.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388b7ae15f8---pureradabema.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/vudebobewar.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/gibakomedonurepotuzal.pdfIn PDF document text
    • http://precisao.net/files/files/wamamoxenemusaxogugidi.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/10286322528.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/82902050361.pdfIn PDF document text
    • http://protok.pro/upload/files/mesavabonimowanufikolaju.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/zoridumipemidukutasug.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/89dcafdf7214a92f68a0b3122b7736a0/25957254208.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/jazufirudakap.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/sekelitakexoren.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/83982862959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+decrease+video+size+without+losing+quality+in+androidPDF 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_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 18020 bytes
SHA-256: f6712d970ce710fca2e239346835ec2f28c22eada3ef54cf37a7f2c2b5647d42
font_01_sfnt_off0001185a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13071 11212 bytes
SHA-256: 73a1e088327b7c86ea6a625a65baff41cacd59741b0a3549ea613f8934a0214d