Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea0753178079b33…

MALICIOUS

PDF

70.4 KB Created: 2021-02-21 18:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 992dba0085aa850503962bd75b20fe7f SHA-1: e0a1cc6833e2d66d9d5283bb63271db22de3b40c SHA-256: cea0753178079b3392eea6f0f22b0d5bd7f9dfa9e55e2b33a6ba0384227ab3b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing campaign. The presence of 'utm_term' parameters in some URLs points towards tracking or redirection for malicious purposes. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation or phishing lures.

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://bologen.ru/123?utm_term=what+is+median+xl+diablo+2 PDF link annotation
    • https://rugibabolunape.weebly.com/uploads/1/3/1/4/131454120/6a15dca127d19.pdfIn PDF document text
    • http://jakor.pro/nadoluwoxenirobirekolituz0juva.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimoxifagi/thhiahe/wigekinab.pdfIn PDF document text
    • https://cdn.sqhk.co/duloputemab/ckTgdAs/fireboy_and_watergirl_unblocked_elements.pdfIn PDF document text
    • http://dwatches.site/vubevaxufanipovamozuvemeb28nb.pdfIn PDF document text
    • http://walletelectrum.buzz/assertive_to_imperative_sentences_exercises5j46k.pdfIn PDF document text
    • https://xetasigebe.weebly.com/uploads/1/3/4/4/134443645/9337673.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/hidibig/60742911445.pdfIn PDF document text
    • https://xaleratugigajij.weebly.com/uploads/1/3/4/6/134631249/suvimutukado_teper_gonam.pdfIn PDF document text
    • http://silkhfig.bid/31940323176nefek.pdfIn PDF document text
    • https://wufipalowev.weebly.com/uploads/1/3/4/5/134595621/eeeacdf.pdfIn PDF document text
    • http://harmony-market.ru/report_identity_theft_to_governmentn148k.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/6400029.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tugafebip/assamese_poem_whatsapp_status_video.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/nunerazuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/40661719270.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_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 5320 bytes
SHA-256: e72faba3307bb1bc171702796eb4c58e9a001a70a996f79cafded3751de6aa39
font_01_sfnt_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 10340 bytes
SHA-256: 9e491a8a2f94f425a75407613cface2ba813689cdd27d5b670d911078d7254be

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