Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9611b1f6f08408…

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 03:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7804687d7c1b7744f960cc829e0bec52 SHA-1: ba664b0b3f083be725dc65778ca0372c1a0d4557 SHA-256: 2d9611b1f6f084085a07fb04240302b9f9cf3db760db6c58ad4531b19bc0d51f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of embedded JavaScript points to an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://coretry.ru/uplcv?utm_term=doctrine+and+covenants+stories+pdf PDF link annotation
    • https://enerjimakine.com/tsrm1/img/userfiles/file/97255371056.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/75363380203.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/tolijovem.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/bavixag.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/87197574316.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/lavuremagobigafivemiv.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/90647137445.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/88224653624.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/mufejanugapar.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/11268332802.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16143a66a96d4c---87396214225.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/27168438244.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fddd383eee9eef31a55570fbb6dfd25c/xesalevisegaxurezo.pdfIn PDF document text
    • http://fpole.ru/sadm_files/birezinotetovezupum.pdfIn PDF document text
    • http://msiutilities.biz/documents/gumusi.pdfIn PDF document text
    • http://jucal.es/images/file/67974206265.pdfIn PDF document text
    • http://humanlitech.com/files/files/97399584349.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/nekigidebode.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/nuzulimo.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/tegolo.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/wiginemosed.pdfIn PDF document text
    • 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_off0000b0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E4 10636 bytes
SHA-256: 20fb93056d3071d0c84214697804e5cd01fc4cf21dd4aa4b9bef5024902b6265
font_01_sfnt_off0000c960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 16316 bytes
SHA-256: 09e1dcd49c5802725aaa8881acb132b961d30e6e709fe53385a5194fea18e4e2

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