Malicious PDF — malware analysis report

Static analysis result for SHA-256 5387f81c25d5e95e…

MALICIOUS

PDF

84.9 KB Created: 2021-03-20 13:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ff8421d72c5df27b6d55476e1da6cec0 SHA-1: 4ebe28e74a8b9f44977fb8eed114b4b962764cf0 SHA-256: 5387f81c25d5e95e3da036cc901d63a11d47658457bcaed38b131455be915e83
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model also indicated maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

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://maypoin.ru/strik?utm_term=royal+caribbean+drink+packages+2019+specials PDF link annotation
    • http://peregukejipesa.iblogger.org/gefomixifulevodenopu.pdfIn PDF document text
    • https://topukutenikoxi.weebly.com/uploads/1/3/4/6/134668920/xanovi.pdfIn PDF document text
    • https://wadaxoleda.weebly.com/uploads/1/3/5/3/135311928/zakumen.pdfIn PDF document text
    • https://mejoraxu.weebly.com/uploads/1/3/1/3/131380998/6472436.pdfIn PDF document text
    • https://cdn.sqhk.co/lowanivari/fic3Rhf/lenanibumarofumazewoze.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/9IOMhYJ/varoperijosewo.pdfIn PDF document text
    • https://tijagure.weebly.com/uploads/1/3/1/3/131398232/kekemavipikuxif.pdfIn PDF document text
    • https://cdn.sqhk.co/libudezetuv/eX3nOBx/hit_and_knockdown_level_31.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/nofowup.pdfIn PDF document text
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/2351090.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/jakujakula/88060101825.pdfIn PDF document text
    • http://melufisagaw.epizy.com/beretta_92x_performance_parts.pdfIn PDF document text
    • http://kegonen.rf.gd/facebook_lite_google_play_store.pdfIn PDF document text
    • http://nelivizazepafo.epizy.com/75169230581.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/zalixikusupabap.pdfIn PDF document text
    • http://redikubegoda.epizy.com/bunker_calculation_software_free.pdfIn PDF document text
    • http://kesekerezox.epizy.com/12840450523.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/pitisipodosekuwelili.pdfIn PDF document text
    • http://gejamuromina.rf.gd/folusosisizu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10990 6036 bytes
SHA-256: 23ccf0d1272cc7726e36d231b38b029e3e7f35fb8711fd027b660ded7a70ee94
font_01_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 11304 bytes
SHA-256: d30509976a48e8383f5275e569dce7bba2087ee469b7150f43e58cc99a3278ad

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