Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edd11441f27ff9d…

MALICIOUS

PDF

79.7 KB Created: 2021-03-31 12:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7d6cbf5849cccbc9ee791ec2561442f6 SHA-1: 40287c9afca9a052915da3431bdf127152cc6287 SHA-256: 5edd11441f27ff9d35393e435269cf59ad3e1de3650ac14c1f6fb3470bf9fbcf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The embedded URLs point to various PDF files, likely intended to drive traffic to these sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/wix?keyword=how+to+make+instant+health+potion+hypixel+skyblock PDF link annotation
    • https://juloxiwam.weebly.com/uploads/1/3/5/9/135967800/lodewaruril_rilujuzolinem.pdfIn PDF document text
    • https://lepamatizetu.weebly.com/uploads/1/3/0/7/130739269/voliw.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/wodofakiril-tevuji-sudamix-niwoxuwawude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474759/normal_601f92a24e6c9.pdfIn PDF document text
    • https://semanipiji.weebly.com/uploads/1/3/5/3/135312460/3253275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5fd841a49be27.pdfIn PDF document text
    • https://saxunada.weebly.com/uploads/1/3/4/8/134865385/47bba7.pdfIn PDF document text
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/womivaburadufo.pdfIn PDF document text
    • https://gebonevoduxap.weebly.com/uploads/1/3/1/6/131606392/vifudul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_6039d74536096.pdfIn PDF document text
    • https://kikizesojumare.weebly.com/uploads/1/3/4/7/134718780/bezuporebo_wawugilupibu.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/muvofi-sirimo-safunikapeg.pdfIn PDF document text
    • https://lodufifed.weebly.com/uploads/1/3/1/4/131411197/lerosoxojogubawarato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_6020ab2fdbd0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_601904b1c3bb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c40de8f-de4b-4c1a-b859-915b5e589f8b/cyberpunk_2077_ps4_pro_performance_issues.pdfIn PDF document text
    • http://zesafemumibow.myartsonline.com/35008372501.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_de0ef2c71a194db981cabfff79d512ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/255e18ea-9b66-4075-855a-de50a3db6c4f/how_much_is_a_zoomer_chair.pdfIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_8445adcf161347e794f9c29929f066a6.pdf?index=trueIn PDF document text
    • http://novupomajanox.atwebpages.com/numerical_and_statistical_methods_techmax.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_07cfefffb2884467ac05650ca92371e7.pdf?index=trueIn PDF document text
    • http://kafotafuvodalix.onlinewebshop.net/libro_de_periodoncia_carranza_11_edicion.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_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 5504 bytes
SHA-256: 6522b09c5d04fd275d6dab540a27fd22afa1e74baadc105a4d30c020b36c23c4
font_01_sfnt_off00010b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 11000 bytes
SHA-256: 96c055042e850e493b7baa72694fc4ca6061cd02d21cb1534e7c108993e5622a