Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4f0a3327a95a64…

MALICIOUS

PDF

75.3 KB Created: 2021-03-24 04:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6e759dbdc6bf701cc698a4424739aacd SHA-1: 6e4cdb35810d6b42a8f105fa15ab2db4b317c6e7 SHA-256: 5a4f0a3327a95a640eefe8c5de1af0d93d02c27bdb0b45de3ae1836a3f6bccdc
126 Risk Score

Malware Insights

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

The PDF contains multiple URLs, with one specifically appearing as a search result for a Hoover vacuum cleaner manual, likely a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and the link farm heuristic suggest the document is designed to redirect users to malicious sites.

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://golowaki.ru/strik?utm_term=hoover+windtunnel+manual+uh70241 PDF link annotation
    • https://cdn.sqhk.co/pigevikuwi/j6Xjdjf/17636916397.pdfIn PDF document text
    • https://cdn.sqhk.co/lazemowul/aY8dRdE/dupuwobal.pdfIn PDF document text
    • https://cdn.sqhk.co/xilasexiki/gdqfCjg/cancer_de_tiroides_papilar.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/5A7hiX6/cheap_living_room_furniture_for_sale_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/zojisixu/ajghhij/taiwanese_pinball_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/aidvgi3/keged.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_f26b3712485a4ef38bc7744279984604.pdf?index=trueIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_bbae601477384ccc9de9ad744ce88ca8.pdf?index=trueIn PDF document text
    • https://14579757-8399-40ae-9aa0-1c510f02119b.filesusr.com/ugd/5613ee_d4d834c1e6854f619924e1fc7fedb7c2.pdf?index=trueIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_1a0d5a89c2974c6cb9e944ecdb8f10c9.pdf?index=trueIn PDF document text
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_284365f5e3d6408297de6056e948fd8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22f5ea3-d267-4291-932e-9b5e4eb4ad44/vibebigopugimebulajowi.pdfIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_7bb93bc67d054353aa1374c2b4a7df9c.pdf?index=trueIn PDF document text
    • http://lekedoxe.rf.gd/crystal_reports_data_not_displaying.pdfIn PDF document text
    • http://vevojadiren.epizy.com/13735290018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95322ef7-67a6-45c4-82f3-fb5df4238048/canon_mp240_user_guide.pdfIn PDF document text
    • http://nakodazik.rf.gd/47772028208.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_ced4547b5f784bf382d29625cda4a2e3.pdf?index=trueIn 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_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 5492 bytes
SHA-256: ad0fefe1203188e66dcbfefe8704a1fdcf49288d5f1623907e27ed698c52f881
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 11564 bytes
SHA-256: d09d44ad8301feee1c8a82266dc156b04f7642a006e21d0063fffedae118a029

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