Malicious PDF — malware analysis report

Static analysis result for SHA-256 899e590e676d0c2a…

MALICIOUS

PDF

76.3 KB Created: 2021-03-02 06:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 316b649f4760cc550dfd233b1dc35220 SHA-1: 279405cf86e187d2a63686c08d186bcaae98ecc5 SHA-256: 899e590e676d0c2a51bc2ab999705523c0afd2e2bf2bdb6a0b308207f6948e0c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URLs and the link farm heuristic suggest the document is designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that aligns with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=how+to+make+baby+gate+for+stairs PDF link annotation
    • https://wapixanap.weebly.com/uploads/1/3/1/1/131164574/52a199ed8b565a7.pdfIn PDF document text
    • https://wenojobopowegit.weebly.com/uploads/1/3/4/8/134879608/ae85ecbe2c30.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/competent_leadership_toastmasters.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/biresiw_tupafir.pdfIn PDF document text
    • https://lojigimab.weebly.com/uploads/1/3/0/8/130814508/8ac6bfb2d8091.pdfIn PDF document text
    • http://regsenatvumen.website/warhammer_40k_tyranid_codex_downloadj1sce.pdfIn PDF document text
    • http://50offstore.pro/rozivapixaov281.pdfIn PDF document text
    • http://fakaripeti.xyz/gurps_basic_set_characters_fourth_ed3paw8.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/1585127.pdfIn PDF document text
    • http://parralax.net/jemukiivdmv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pesuvomekujidi.rf.gd/65645289772.pdfIn PDF document text
    • http://xutarefes.epizy.com/video_game_bus_simulator_indonesia.pdfIn PDF document text
    • http://wusudafatuzawe.epizy.com/dodatamejeguke.pdfIn PDF document text
    • http://pazizota.rf.gd/rofepiwekufofofabo.pdfIn PDF document text
    • http://dojopugoput.epizy.com/lawyer_cv_template_doc.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/jujesixunu.pdfIn PDF document text
    • http://janarisugikev.rf.gd/anne_of_green_gables_movie_script.pdfIn PDF document text
    • http://dotenax.rf.gd/90702383866.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_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 5416 bytes
SHA-256: dddb354c16b3765cb203dcf5a97f8f8820482cc0fe3dda89072c6ad3e8079555
font_01_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 10436 bytes
SHA-256: ac20332e4f0cf36788ff0b8551495c9e493ed88ce1c6f088edc34dfb707cfaf8

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