Malicious PDF — malware analysis report

Static analysis result for SHA-256 5360bf0de8a62a51…

MALICIOUS

PDF

94.5 KB Created: 2021-04-08 00:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01307b99689a44f087cdd1ed59efe881 SHA-1: 7b1865faa4fd8bce4a34dd1d403a024d4e6242ae SHA-256: 5360bf0de8a62a51d473b7b063c468e5e2f417b4e8cdbb9e71d211d59f79e832
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is a link farm, with one primary external URI pointing to a URL designed to appear as a search result. This URL, 'https://jumiwimov.ru/wix?keyword=dna+replication+web+activity+answers', is likely intended to redirect users to malicious content. The presence of numerous other PDF links, including one to 'https://s3.amazonaws.com/tugumeb/gejudi.pdf', further supports the link farm and potential phishing or malware distribution intent. The ML classifier and ClamAV detection strongly indicate maliciousness.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=dna+replication+web+activity+answers
    • http://nusobuxiwu.iblogger.org/best_architecture_books_for_students.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tugumeb/gejudi.pdf
    • https://uploads.strikinglycdn.com/files/0a2e1ef3-eceb-4c3a-918e-fb54070e42c5/83000696788.pdf
    • https://s3.amazonaws.com/jotizifime/29083812114.pdf
    • https://s3.amazonaws.com/baritexovopa/10937923431.pdf
    • https://s3.amazonaws.com/tadevewuju/96213698892.pdf
    • https://s3.amazonaws.com/fifomi/91933058226.pdf
    • https://e9542b43-fb79-4c62-94a9-c66526381fce.filesusr.com/ugd/4142f3_9475fa894227434c9d5c536afa8c4821.pdf?index=true
    • https://s3.amazonaws.com/jukoxisojow/free_affidavit_template_ontario.pdf
    • http://kejusekijo.epizy.com/unidades_de_longitud_del_sistema_ingles_y_sus_equivalencias.pdf
    • https://uploads.strikinglycdn.com/files/456021b4-3f6a-41a3-a419-abe8cd24f291/how_to_learn_about_forex_currency_trading_for_free.pdf
    • https://s3.amazonaws.com/sinamozagemoger/20035848191.pdf
    • http://jesebikalag.epizy.com/xatuvina.pdf
    • https://uploads.strikinglycdn.com/files/72b45f93-1fe7-4944-aac6-e8a58fa6620c/britax_marathon_height_weight_limit.pdf
    • https://s3.amazonaws.com/migivewuwe/mini_crib_mattress_sheets.pdf
    • http://buzuvemujogumob.epizy.com/gunuditip.pdf
    • https://uploads.strikinglycdn.com/files/76e11218-f44d-4169-9cc8-99efe6aabd3e/throne_of_glass_complete_series_hardcover.pdf
    • https://s3.amazonaws.com/tezude/singular_and_plural_nouns_worksheet_for_3rd_grade.pdf
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_ff4d63fcf11a46ceac50e3e36e64a82e.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117a6.bin
e52c0aa38a55e418b574c986b8f7b4b6305e6cf7993de616d9dbda8a5bed76da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117A6 5320 bytes
font_01_sfnt_off000129ea.bin
2ded7420637c9ca25a2efce0123b62d926a42db9b2e4212a8afc9c0e874b437d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129EA 13468 bytes
font_02_sfnt_off00015799.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15799 16060 bytes

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