Malicious PDF — malware analysis report

Static analysis result for SHA-256 995e26c6f5b14947…

MALICIOUS

PDF

65.8 KB Created: 2021-02-16 11:36:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 487b330a34fb63083b43f25834c54876 SHA-1: f2354142b648ddced07d774742ed49abf6e6f090 SHA-256: 995e26c6f5b1494762f5e24e4acc50bdef832f24a3c822aba628108405b86f50
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the ML classifier output strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=sig+sp2022+9mm+15+round+magazine PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365606/normal_5ffbd14b97ec9.pdfIn PDF document text
    • http://idealslimitaly-official.site/6266225020uowv5.pdfIn PDF document text
    • http://save50.pro/2812528524aou9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496602/normal_5feb97a0a66fb.pdfIn PDF document text
    • https://cdn.sqhk.co/boketumejipa/gd8jbha/mifaduguzajozokorunuja.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/2LqF3hb/mezidegodudisekajalatarib.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/iEjaiuD/96358447549.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/Sgf7ieZ/dragon_village_m_apk_mod.pdfIn PDF document text
    • http://fakibukilab.22web.org/78309127048.pdfIn PDF document text
    • http://hookup682.site/hans_zimmer_interstellar_piano_sheet_musicoc2st.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/eXIw49Q/truck_driver_city_crush.pdfIn PDF document text
    • http://xusolupofedowi.iblogger.org/wuniba.pdfIn PDF document text
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/5f53e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_6024293ba1785.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/hgVKLhj/raid_shadow_legends_cheat_codes.pdfIn PDF document text
    • https://setixifofu.weebly.com/uploads/1/3/1/6/131606861/nalizuripoxikezopiw.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/65996707109k1k9w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favirivesez.epizy.com/allluia_psaume_117.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_off0000c2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DA 6004 bytes
SHA-256: 2e54fff44bfc4426d191335650032a7a09171ecf2e778610c65d64942f2d11d2
font_01_sfnt_off0000d740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 10148 bytes
SHA-256: 65c4112f0b04014282d7d146cbd6c09c1bf0054dbaa3d712a72ea777c80cf43d

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