Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a14928d632f785…

MALICIOUS

PDF

77.6 KB Created: 2021-04-05 06:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f12c374e9b187b1924e9c0bd6c23b08c SHA-1: 911e4a58a1c5ecae799b14b8c06bd1e7d91d65c8 SHA-256: 41a14928d632f785fc54bcb8f394b169e6795cb370e1bdb4947947e2b5c5eca9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to a Dewalt saw, suggesting a lure to attract victims to the malicious sites.

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://botokaw.ru/strik?utm_term=dewalt+sliding+compound+miter+saw+10+inch
    • http://mikovil.mywebcommunity.org/19869163510.pdf
    • http://youtube-subscribes.com/xezesixamorapivoriv46uwg.pdf
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/nabawisarere.pdf
    • https://cdn-cms.f-static.net/uploads/4369638/normal_601b923f26c84.pdf
    • https://jugozufenuw.weebly.com/uploads/1/3/4/2/134266135/dowibi-jovunowat-mozolinu.pdf
    • http://daxamel.mywebcommunity.org/5169444129.pdf
    • http://worelimupuvefam.mywebcommunity.org/navigator_bible_study.pdf
    • http://kazimibi.getenjoyment.net/toefl_test_examples.pdf
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/nusub.pdf
    • https://cdn-cms.f-static.net/uploads/4475219/normal_606a5f2e3bfbc.pdf
    • https://cdn-cms.f-static.net/uploads/4416125/normal_6011b8bfdb459.pdf
    • http://my-favshoph.online/jurnal_nyamuk_anophelesilhwx.pdf
    • http://barbanapoli.moscow/maths_negative_numbers_worksheetpx8tf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kepofif.onlinewebshop.net/zadudesevabijezem.pdf
    • https://uploads.strikinglycdn.com/files/869201a4-bfb3-42af-8644-ecb8d016d5a5/project_management_101_presentation.pdf
    • http://dazejifudora.onlinewebshop.net/geologic_time_scale.pdf
    • http://sazurufupamaxa.myartsonline.com/sisefewaxigisawadovomoti.pdf
    • https://uploads.strikinglycdn.com/files/2a4ea9ac-c4a4-4ad3-b860-493718239d2a/89771740348.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edea.bin
f3f81e111ca79e20eb39b2028c6f4aa3efa90467ee9fe874b39d52a44c6dc10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 5772 bytes
font_01_sfnt_off00010188.bin
8f64d26261a1820d2055b73aee5e4d027eecf5eb4320d1a73f8e9f0c1e449aec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 11504 bytes

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