Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee9d6c64610ff39…

MALICIOUS

PDF

72.4 KB Created: 2021-05-20 18:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 88f24384548fab615aea64b31edffae2 SHA-1: e92daa69ade93b430e4f2696efb84c6e5937b09e SHA-256: fee9d6c64610ff396836ca68bb9b6d87f62c0c2f6b166bec252f6695b76d0917
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to a suspicious URL. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=el+poder+curativo+de+la+c%25C3%25A1bala+pdf+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384029/normal_5ff8b54120603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_60610c55c4a77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446642/normal_60003beda1381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fdb0290c69a0.pdfIn PDF document text
    • https://xexiroxenokela.weebly.com/uploads/1/3/4/6/134613030/menabemovorubiwul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491169/normal_60029f5be9f15.pdfIn PDF document text
    • https://bopiwode.weebly.com/uploads/1/3/4/3/134367631/b97d91558bc9d9c.pdfIn PDF document text
    • https://xapotitiguwux.weebly.com/uploads/1/3/4/6/134668809/8959638.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/5a5a4e9b-8011-4d08-8614-a1d2092de7cb/does_twilight_have_a_sequel.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/xizifivix.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/43305937924.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/30199288664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2426aa63-33a2-438c-848c-838d1a9170ec/10124587926.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/what_is_common_law_employment_contracts.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/7023722757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dcc6c49-ca4d-42da-86cc-7b88677dd3fc/fikibez.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/33127161406.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/12387370344.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/28491724954.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/sevodupusumozilewupu.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/cpcsea_guidelines_to_conduct_experiments_on_animals.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/c_programming_for_scientists_and_engineers_with_applications.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/how_to_knit_baby_socks_on_circular_needles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25020b16-7746-49f9-b825-c3040d13de47/jedovedebetokavikanoxegid.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_off0000d93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 5716 bytes
SHA-256: 0044be48ae74a1644e3928a71186c9ecc66c0f0eb35bdd1ba70760b23e161dda
font_01_sfnt_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 11584 bytes
SHA-256: 1291411c2adbd30bb2d0cc36149784d1631375c615ada6e2581503e596010494

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