Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffc3f12cf617978…

MALICIOUS

PDF

73.3 KB Created: 2021-05-01 21:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f196a4011264e8f97d13b4c1d19cd834 SHA-1: 7d4a26331610d50838bfad96ce4fb40c0adb2ea2 SHA-256: fffc3f12cf6179782ccc27cf1b569341441bc0020a47580d0b2d43ef8864113a
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing a significant number of external URLs pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of numerous external links suggests an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=genie+model+7055+learn+code+button
    • http://idealicaitalia-official.site/stock_market_investing_books_warren_buffettlfj0f.pdf
    • https://sufosuzupunu.weebly.com/uploads/1/3/1/3/131379650/befafaridedi.pdf
    • http://jonimowar.iblogger.org/50693845270.pdf
    • http://vuwaxuw.22web.org/dekenatodonisubep.pdf
    • https://lowalijadu.weebly.com/uploads/1/3/4/8/134866304/3026c7.pdf
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/0c91abd86fd.pdf
    • https://vufagejibuto.weebly.com/uploads/1/3/1/4/131483336/4137068.pdf
    • https://tufibexewati.weebly.com/uploads/1/3/4/5/134583298/8e8fbce67.pdf
    • https://mefinijusigoti.weebly.com/uploads/1/3/4/4/134499215/3eb01fa.pdf
    • http://mattelipsticks.site/american_film_a_history_jon_lewis69xs4.pdf
    • https://ruxikikigiligex.weebly.com/uploads/1/3/4/3/134347308/wobujidima-kurosibu-torapita.pdf
    • https://namonivet.weebly.com/uploads/1/3/4/4/134493383/nidojumij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c8f0d892-4c73-447a-841b-b6a48a565a7d.filesusr.com/ugd/928a57_220e47ddfe744e4cbfadd4a1bdf3625f.pdf?index=true
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_0ca7e82ee44b4af7adfe6f56bc4555e1.pdf?index=true
    • http://jejuton.rf.gd/94323076139.pdf
    • http://kegunujav.epizy.com/rofovogazi.pdf
    • http://mikugux.rf.gd/how_to_install_groupme_on_apple_watch.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda3.bin
1d7accf8780767c97ed091a13b27ffa63cf0815d43661d606ebfdf40f0afa49b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 5424 bytes
font_01_sfnt_off0000f007.bin
42b57e9136626b5efb733816b45806bc1ef2590c23963e166a99273ea8391190		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 11976 bytes

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