Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5093e6252be64e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-24 11:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b08cfc83afc08fbcf17c009c71953bbd SHA-1: 6578ad378267d841d5b9d47005cc3761edb9c035 SHA-256: 5a5093e6252be64ef338acc48ba0d83d1df2335f9db0a40ca6bce57f09152505
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to one of the numerous external URLs found in the sample, which are often used for phishing or to download further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=positive+words+with+letter+r PDF link annotation
    • http://www.cottagegrad.ru/files/file/fobeberodumefijize.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdaa21448e---fedajewatogawawugof.pdfIn PDF document text
    • https://slide-bearing.com/d/files/nevunamefalasesixomatomo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161452f9af2fbb---sufudetifipemogunodolo.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/60257511506.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109101247576584.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/40928792393.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/23713027998.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/tovupidaf.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/5973026051.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/nuwapadisoxobiketikubi.pdfIn PDF document text
    • http://twilaw.com/files/files/91719073811.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/77017602072.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/moxulubevadokodede.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/dovesebor.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109221525577354.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/vasabenewobukefovuret.pdfIn PDF document text
    • http://whygzy.com/Media/Uploads/files/42197376613.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/likujapis.pdfIn PDF document text
    • http://m2m2design.com/userfiles/67514176725.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/xeluwukakakosoxebuvuxab.pdfIn PDF document text
    • https://blokhol.com/upload/files/33160699720.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/91827188586.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_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 10232 bytes
SHA-256: a40ba9908477c0a6c9858aaf1bedf9ec4631158a8928e464b4740643da48b48a
font_01_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 18648 bytes
SHA-256: e6e266d97925e5da4c51c1668185b1aa876858f7b29567d9026b6a9e22c31a73
font_02_sfnt_off000130ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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