Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8e22d3326a3fd7…

MALICIOUS

PDF

73.9 KB Created: 2021-02-17 21:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5e9bb72af7512bed7b7cb050f14424c5 SHA-1: afc9b806eddb21d63e6554904f689dc02ae90a01 SHA-256: da8e22d3326a3fd72984c408703670ad9782d397f8535daa1c8a5ad1c033a52a
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's content, though heavily obfuscated, appears to be a lure related to 'Kentucky falls trail', likely designed to trick users into visiting 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://jacksth.ru/wix?keyword=kentucky+falls+trail PDF link annotation
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/3003102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_6025b5ed38fc0.pdfIn PDF document text
    • http://myfoxing.online/vifobapiboxobdu0d.pdfIn PDF document text
    • http://milano-moda.space/harmonic_oscillator_potentialoh87g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476758/normal_6021f882596aa.pdfIn PDF document text
    • https://sobopagugakevul.weebly.com/uploads/1/3/4/8/134881985/xitatawerokidopub.pdfIn PDF document text
    • https://vekaforu.weebly.com/uploads/1/3/4/7/134747957/vupaduzavelegunikul.pdfIn PDF document text
    • http://reduslim-ordina.site/98299518517ew9ox.pdfIn PDF document text
    • http://front-glass.website/elements_of_art_color8fsu1.pdfIn PDF document text
    • http://blancer.xyz/petepezoduwotan2dct2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_600c3de49cd46.pdfIn PDF document text
    • https://vimosetadasosus.weebly.com/uploads/1/3/2/7/132740377/nilekodoturo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_5fe64df5bd913.pdfIn PDF document text
    • https://xakolino.weebly.com/uploads/1/3/1/4/131453712/dakusemekag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_600a7851acf2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388052/normal_60034418d7ad0.pdfIn PDF document text
    • https://kebedemozi.weebly.com/uploads/1/3/0/7/130775588/6420221.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kefixofelapadi.epizy.com/cashing_out_annual_leave_letter_template.pdfIn PDF document text
    • http://gagivipupine.epizy.com/asphalt_8_hack_money_android.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_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 5012 bytes
SHA-256: 4e71cf1dedff6c4e616cb2dc5319c27d74eec7637ef2cdcdfc8e0da3acf3ba32
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 10984 bytes
SHA-256: bb18da1c3e64f5244f2a6486b17ee603cc8f572c0a83b2bcc8e4f4bfc64d5270

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