Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd202dfd8857d22d…

MALICIOUS

PDF

69.1 KB Created: 2021-02-16 17:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cfbe96d7e8887f3e672d5c9d78caf73b SHA-1: 614420e1578cee070cd1981966b4dd9203cb29c9 SHA-256: dd202dfd8857d22ddd08b5319e7b7daa3ad379ae12fd7697bc697c2f8daa31d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=relative+pronoun+worksheet+esl PDF link annotation
    • https://xuvupidorok.weebly.com/uploads/1/3/1/4/131407629/matomuvevugigav.pdfIn PDF document text
    • http://wabexikorininaz.22web.org/41301656886.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/yQgeCgh/gufogutoro.pdfIn PDF document text
    • http://geekcods.com/86440506459flhwg.pdfIn PDF document text
    • http://feedbacrnz.space/cdc_clabsi_worksheeta971y.pdfIn PDF document text
    • http://lajulufubugo.22web.org/ajooba_movie_song.pdfIn PDF document text
    • https://cdn.sqhk.co/zusegekum/dderShc/wiwuxojibewezigunokan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bomemab.epizy.com/bivasorivafi.pdfIn PDF document text
    • http://vetuvadoxawiton.epizy.com/rugimisapumuside.pdfIn PDF document text
    • http://toxisokipefofo.epizy.com/xijexazenavuno.pdfIn PDF document text
    • http://vegidegeje.rf.gd/38830567401.pdfIn PDF document text
    • http://rolozipufulelo.rf.gd/company_vehicle_inspection_checklist_template.pdfIn PDF document text
    • http://salalew.epizy.com/zexinoberoguxigifat.pdfIn PDF document text
    • http://defipezisezujor.rf.gd/nccn_guidelines_multiple_myeloma_2019.pdfIn PDF document text
    • http://zofutigo.epizy.com/76245952734.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32F 5128 bytes
SHA-256: 9a4b870e6523ac92bea39f23c420665040a12a0c50de140cddcf63148b238c27
font_01_sfnt_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 10152 bytes
SHA-256: cf5ff4f30497d2db4629f96a4960920e37ff059ccb94766f8c28dbb37526b02e

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