Malicious PDF — malware analysis report

Static analysis result for SHA-256 4718d3b655e14089…

MALICIOUS

PDF

87.2 KB Created: 2021-03-03 22:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eeb0715cb99a50a469810877081290a0 SHA-1: 0bd5faf1d64efc5f5766c28837420cb330e1cf4b SHA-256: 4718d3b655e14089f289ab218356ffdf5171c8d62399edc6d0a624996f9b105d
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 presence of numerous embedded URLs, many pointing to disposable domains, suggests a phishing or link-farming scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf', which can be used to generate PDFs from web content, further supporting the idea that the PDF is a wrapper for malicious links.

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://nipisod.ru/wix?keyword=the+watsons+go+to+birmingham+unit+test+answers PDF link annotation
    • http://linilemutigonoz.22web.org/20189823928.pdfIn PDF document text
    • http://fsbsiod.com/spring_awakening_sheet_music_freei0tv1.pdfIn PDF document text
    • http://taxokisekajetek.22web.org/bafitamakisilat.pdfIn PDF document text
    • http://healthit.space/kaththi_movie_bgm_remix9aype.pdfIn PDF document text
    • https://tajezutudod.weebly.com/uploads/1/3/1/3/131398094/cc56ad05b3b.pdfIn PDF document text
    • http://claire-irk.ru/kalowowitigigoxejumanikod0iac.pdfIn PDF document text
    • http://steblin.pro/baxofemesisebiluwusovekbjvg.pdfIn PDF document text
    • http://supijijuzumapiz.iblogger.org/kikuturitujofupapuda.pdfIn PDF document text
    • http://furafofuvobomu.22web.org/charla_de_seguridad_novedosas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lubesugoninop.epizy.com/46455412420.pdfIn PDF document text
    • http://nekexixi.epizy.com/bose_sounddock_10_remote_code.pdfIn PDF document text
    • http://rolezudebozi.rf.gd/pirate_eye_patch_printable_template.pdfIn PDF document text
    • http://bexalawisilinot.epizy.com/xizososorexugi.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_off00011a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6E 5248 bytes
SHA-256: 8bc2dc00f655f3cdbdd6ca4201ae1a9b205662dc6c49bf1e8f56719f49559362
font_01_sfnt_off00012c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C33 10364 bytes
SHA-256: 8791b8b109d1f4b4ba2aeff5b2ef7604c9aa3582e4e36d3feca6a7661ad59e3a

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