Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e7a2554a9cbb5d…

MALICIOUS

PDF

84.1 KB Created: 2021-02-28 17:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 66f88a0837a78ffb3558a8cadb095d2e SHA-1: 24cb2e9ce50af17e2c5276d49592a3a805deea7a SHA-256: 89e7a2554a9cbb5df830ee6078be6ff2cbd37bb43985b4975201ee92d69c6ac3
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 maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and forming a link farm, strongly suggests a phishing or malware distribution attempt. The document body, though partially corrupted, contains keywords related to hacking and references the wkhtmltopdf tool, indicating it was likely generated programmatically to host malicious links.

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://mezovuduw.ru/wix?keyword=robot+skater+hacked PDF link annotation
    • http://iranomics.com/mosora2sxk1.pdfIn PDF document text
    • http://bigpleasure.ru/linear_inequalities_worksheet_graphingx36fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_603151097361f.pdfIn PDF document text
    • https://disaximineta.weebly.com/uploads/1/3/4/8/134883765/15cb131c80d7.pdfIn PDF document text
    • https://cdn.sqhk.co/gefisodir/hjLibha/cairo_supper_club_chicago.pdfIn PDF document text
    • http://shopsupergood.site/propiedades_de_la_materia_cualitativasgom9c.pdfIn PDF document text
    • http://esparks.ru/castellar_font_free_maccjjxd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366011/normal_5fc939292dac6.pdfIn PDF document text
    • https://pinuxijevafu.weebly.com/uploads/1/3/4/6/134608025/rexeso_bisunelebipu_palini.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/jagjJgd/warhammer_quest_2_the_end_times_wiki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fizuxobitunoge.epizy.com/wamemopiwovositunip.pdfIn PDF document text
    • http://kitivej.epizy.com/lamiberofiwu.pdfIn PDF document text
    • http://madukavinoxonal.epizy.com/tsunami_2004_movie.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_off00010bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 5208 bytes
SHA-256: c0411c98ea86b8971af79c63d6ef9766eba9d4f8fc0fe94f550f89b05690228b
font_01_sfnt_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 11988 bytes
SHA-256: 9d3ecb99ed932a3b2b87fc783b490649a7e1ae4979e0fbd7df29e4a9c5c00918

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