Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df5adb1580ef6cf…

MALICIOUS

PDF

171.7 KB Created: 2021-05-13 15:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6156b3bd2c4daf2f084ee8fad8c58b95 SHA-1: dc723e388f3c28a3e8277bbdb1c8eb23712a429c SHA-256: 3df5adb1580ef6cf3cd4caa8b021aa0802b5ed4bb2da17515b2c1c0d1c7fb469
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, including one pointing to 'vilenefex.ru' and another to 'shoplus.info', suggesting it is used to redirect users to potentially malicious websites. The PDF's structure and the presence of multiple links on disposable hosting indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=hana+wa+saku+ka+lyrics PDF link annotation
    • http://shoplus.info/depipowawakilawibubef4i2nr.pdfIn PDF document text
    • http://leomannapov.com/41642843218otkxq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485591/normal_60179c361d606.pdfIn PDF document text
    • https://notomufibaka.weebly.com/uploads/1/3/2/7/132740278/govepozufol-pekuzitasix.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/fjfG2VF/kobe_vs_lebron_stats_against_each_other.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/e3cc5a.pdfIn PDF document text
    • http://visiblawty.com/40766231142n8svz.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/1pJ6xid/tekadegewubeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465919/normal_5fff5d864fec9.pdfIn PDF document text
    • https://janafapaxe.weebly.com/uploads/1/3/1/6/131606835/perinukozax-lodawizurap-madudu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454184/normal_5fe5d724df779.pdfIn PDF document text
    • http://devicesprotectionforusers.site/xulufudabifugunibu2981.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/zasepo/pegikokotafasaregesaxeb.pdfIn PDF document text
    • https://4c80ca50-31de-4e6f-b265-471620011c4a.filesusr.com/ugd/08c6b7_bfa9fad42bef4470b0ec09b60558b479.pdf?index=trueIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_5bfee7ad792d4bb6872a6daeceffc5eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/12206191369.pdfIn PDF document text
    • https://f92484db-e5b4-41f8-9431-508412042773.filesusr.com/ugd/b04c15_95c61d6561984acb971d524e6a39f014.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_ec881575ffdc4843a9d07564495f5b10.pdf?index=trueIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_c3e76070105b4da58e7cfbee70fc0c27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomuper/arjun_reddy_trailer_ringtone.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00011896.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11896 111812 bytes
SHA-256: 65159ad547022107cde13ea01e55f3075fc5deeaa1ff79139f88f1184addc341
font_01_sfnt_off0002663e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2663E 5012 bytes
SHA-256: 71462ef7c86682458fea96a3144566b2c2b4935fe239d42563cc72c9d279578c
font_02_sfnt_off00027774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27774 12028 bytes
SHA-256: 89d5158f1bf50887e650bcebaa3d2019cc5246f062a97bf66f00bfa0b6f0bc30

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