Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1f38843be95ff6…

MALICIOUS

PDF

98.3 KB Created: 2021-02-21 19:33:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 7954eb4888c5cc794d8f71c8c537c336 SHA-1: 4a4728be53e619d81314529258df9031cc6b698f SHA-256: 5a1f38843be95ff6eafcead92c82a77fc9bb107ce167c206148896d44c6d3737
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

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://druttle.ru/123?utm_term=what+are+the+basic+korean+words PDF link annotation
    • http://haustova.com/805442594885a22y.pdfIn PDF document text
    • http://fit-italy.space/58088729053vmaca.pdfIn PDF document text
    • http://sanadewa.iblogger.org/vibizolinuv.pdfIn PDF document text
    • https://wetogukonitama.weebly.com/uploads/1/3/3/9/133997956/pojer-lirotis-xofosogifekup.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/jivimufamiwezas.pdfIn PDF document text
    • http://dompodklyuch.com/varozolekufiwo0wb3p.pdfIn PDF document text
    • http://idealica-italy.site/bazagubube9d5h2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386333/normal_5ffe710a10c6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471481/normal_600657c3cde39.pdfIn PDF document text
    • http://zegevuk.22web.org/anti_bribery_management_system.pdfIn PDF document text
    • https://fudesatalaponu.weebly.com/uploads/1/3/2/7/132710537/zilekawidox.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/a690538db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mipovigubebi.rf.gd/mifatekizazisefej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 32788 bytes
SHA-256: 565572c28c210cb3d2a67ab5aaf8555ce64616674f8f4925f62a7593986e8c97
font_01_sfnt_off00014582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14582 5304 bytes
SHA-256: c5e9b615f6c114779ed51aa9be9802e3d846cd03da922cd7835fdf78b2f4f7ae
font_02_sfnt_off00015799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15799 10428 bytes
SHA-256: 0406c5c05ba3c91e055995d62517947a9d43d108909b049c001d9f872dd2631d

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