Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a497a37ce0d289…

MALICIOUS

PDF

74.5 KB Created: 2021-02-17 22:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c5e22740349d2c6483828016ec1dc63d SHA-1: aa9ab8d0ee6b14460a6ebba1a342e0b9531cba0c SHA-256: 72a497a37ce0d2898cb378455a622e9e1e39f5e910c20c27436b361678ac855c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution vector.

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/wb?keyword=read%20the%20bible%20in%2090%20days%20youversion PDF link annotation
    • http://naturagrush.space/19914175885d4w7w.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/11485224206kqy29.pdfIn PDF document text
    • http://graatorama.space/1179675675jydso.pdfIn PDF document text
    • https://cdn.sqhk.co/nopavoboriru/jbgdjeW/63783517112.pdfIn PDF document text
    • http://tricitysikhs.com/divorce_remedy_ebook5bufg.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/99314796229pcy3b.pdfIn PDF document text
    • http://triple-doska6.club/79227713309iq1z4.pdfIn PDF document text
    • http://1xbet-registrat.site/tuxiguvebibefafo61npk.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/fbghGqI/jerosomemi.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebevon/fieRjan/pumogimulaweretamewurujom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nekexixi.epizy.com/20797700274.pdfIn PDF document text
    • http://sujimivotabis.rf.gd/research_progress_report_nus.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/wunusevawatewej.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_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 5520 bytes
SHA-256: 40bbe2c61a851e6b701a043a70d720398e959b9ba61439ba1a27369c18b7104f
font_01_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 10756 bytes
SHA-256: 2362173e25a619f66b7b3d0b306a0a402344101bf4675699e2763b98091a0c52

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