Malicious PDF — malware analysis report

Static analysis result for SHA-256 a963be9034dc7d5b…

MALICIOUS

PDF

66.6 KB Created: 2021-02-16 00:28:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 011d1c7bd0b20ed17bcd4c8fd703a955 SHA-1: b164c7711959737cb21958c391c287c022f34ab8 SHA-256: a963be9034dc7d5b6f050bfcf70efe6fc2ef8780fe1693e0e50a011e1e4995ee
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a machine learning model and ClamAV, as malicious. It contains a large number of embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to 'Disney bedtime stories'. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect users to malicious content.

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=disney+bedtime+stories+read+aloud PDF link annotation
    • https://cdn.sqhk.co/moxibusas/RgTiaib/1400664952.pdfIn PDF document text
    • https://fekukutetixamam.weebly.com/uploads/1/3/4/6/134636283/1cdca.pdfIn PDF document text
    • https://ridejotewofo.weebly.com/uploads/1/3/5/3/135314456/sobeg.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/Bjcjf4B/wosaxebewewisukan.pdfIn PDF document text
    • https://piziruzebizopu.weebly.com/uploads/1/3/4/3/134350425/leresijuwiwusogima.pdfIn PDF document text
    • http://onlyforyou.space/pujalomovamudidovobct2k0.pdfIn PDF document text
    • http://healthyforczechrepublic.site/python_crash_course_eric_matthesesc6h.pdfIn PDF document text
    • https://kazedodaregiz.weebly.com/uploads/1/3/4/3/134368633/94b10517.pdfIn PDF document text
    • http://ru-order-687646765445.art/xinubamatugizaky12da.pdfIn PDF document text
    • https://sotemupavunu.weebly.com/uploads/1/3/1/4/131413148/e33020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepenolewiri.epizy.com/android_tv_box_2019_pantip.pdfIn PDF document text
    • http://keberugut.epizy.com/anycast_m2_plus__android.pdfIn PDF document text
    • http://mubaviz.epizy.com/nuwukukiborubirurebiw.pdfIn PDF document text
    • http://vutilunero.rf.gd/superdry_ladies_xl_size_guide.pdfIn PDF document text
    • http://zikenonuto.epizy.com/counter_strike_online_nexon_zombie.pdfIn PDF document text
    • http://vazorilumi.epizy.com/48708482311.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_off0000c668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC668 5212 bytes
SHA-256: fd9356556a74c5fcd0a15991ff9f6dacd8a641d2b63756c90430eface82737a4
font_01_sfnt_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 10600 bytes
SHA-256: 6fc2b8a1c67d34699bfa604f2997058e5c5b46dad9d354c4b7414f82d41cc9c5

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