Malicious PDF — malware analysis report

Static analysis result for SHA-256 62afda99df37c281…

MALICIOUS

PDF

81.8 KB Created: 2021-04-07 20:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9009b95eafc9868efa34c9d4ef26ac2e SHA-1: 7cbfd4545eb2283c5f288939588b61dbe9fb1e37 SHA-256: 62afda99df37c28153626bade8835973c61e4ba347f37ecdda2a8dfd51b1e192
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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/strik?utm_term=rhino+meaning+in+james+and+the+giant+peach
    • https://cdn.sqhk.co/vituxezij/iqcKhao/5277623022.pdf
    • https://cdn.sqhk.co/nixafusoda/hipgjid/raduregifewugotigegarox.pdf
    • https://cdn.sqhk.co/runenuti/xgjZjad/free_calendar_october_2020_template.pdf
    • https://cdn-cms.f-static.net/uploads/4417526/normal_605091377bd99.pdf
    • https://cdn.sqhk.co/vuvesanap/anhegh2/icymi_acronym_define.pdf
    • https://cdn-cms.f-static.net/uploads/4373511/normal_60175439ebd80.pdf
    • http://mexuloxuxinona.iblogger.org/when_did_samsung_note_3_come_out.pdf
    • https://cdn-cms.f-static.net/uploads/4453914/normal_606539a750000.pdf
    • https://cdn.sqhk.co/pategazikiw/fAgcCsj/weporiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pavasokunise.epizy.com/7870948819.pdf
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_3ab354f2d50f47e7998ce8cb5cdacbc2.pdf?index=true
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_7eb9f479fc464808b71757d423e2e5bc.pdf?index=true
    • http://pixabexodexub.rf.gd/52702995023.pdf
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_107f3b8d261e4ff18cd2ff415c020958.pdf?index=true
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_91267569b63b4a4c9ed29ab7e01b097c.pdf?index=true
    • http://xijovapafibowuw.rf.gd/que_es_la_certificacion_leed.pdf
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_f93d0815ea994e58bde3d8aee3ed671d.pdf?index=true
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_cc940a56432e414c9f49b5bf1d42276b.pdf?index=true
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_f1815c2d3ee3424a9b33239c0accb669.pdf?index=true
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_46e1d9f7da3c4fff9ab447fa2d8fa565.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f429.bin
c85ffc4c3fa2d5906ffb6b4c71428729e1a94dde2d47ee4423bfc8110590f0b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 5228 bytes
font_01_sfnt_off000105c4.bin
6506390754f304375f4edccbd939219987b7a50cf0d87f81248c2a887a960b99
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 10664 bytes
font_02_sfnt_off00012a0e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 4324 bytes