Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c5e507022084c7…

MALICIOUS

PDF

80.9 KB Created: 2021-03-25 06:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a2533a3ead350ac2674dd0b853f5820 SHA-1: 50ff6e710002d0b8320b5a68ae585d63467d367e SHA-256: 51c5e507022084c772f8129eec595a980dd435bb810a171cb3112a3a9cd054fd
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. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack. The primary IOCs are the external URLs found within the document.

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://xajibur.ru/strik?utm_term=13+reasons+why+season+4+plot+reddit
    • https://bunixidulot.weebly.com/uploads/1/3/5/9/135964284/b2d526205cd965.pdf
    • https://cdn-cms.f-static.net/uploads/4467576/normal_604e14f371bcf.pdf
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5ff49c07c43a8.pdf
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/bijisavu.pdf
    • http://trackengine.host/tokyo_ghoul_review_mangapnlet.pdf
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/nevidekoxam.pdf
    • http://vazagitomis.mypressonline.com/96703693562.pdf
    • https://vapigoje.weebly.com/uploads/1/3/5/3/135391726/xinov-wakewunuvavun-mowebis-rasubezosasapej.pdf
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/wepejuzumi.pdf
    • https://cdn-cms.f-static.net/uploads/4366341/normal_6032e2aa59d32.pdf
    • http://pakaxofuj.sportsontheweb.net/41825114252.pdf
    • https://cdn-cms.f-static.net/uploads/4455916/normal_6051a163521e2.pdf
    • http://ig-about.net/free_letter_b_sound_worksheetsusasb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/812b081e-865e-4a37-b524-18a6861bd44d/descargar_lista_de_verbos_regulares_e_irregulares_en_ingles.pdf
    • https://uploads.strikinglycdn.com/files/096fe3d1-eeaa-457d-bd84-1221e884bac1/96748984307.pdf
    • https://uploads.strikinglycdn.com/files/7b26370a-ec73-4232-9b88-c94a6efebcc8/pakistan_studies_book_for_class_9_in_urdu_new_edition.pdf
    • https://uploads.strikinglycdn.com/files/1155c161-ff45-4962-ba94-fd7728d0ce7d/12339713961.pdf
    • https://uploads.strikinglycdn.com/files/3cfd4654-ac9a-4b96-81e4-ecfb990e92d4/timadibudunubujiposef.pdf
    • https://uploads.strikinglycdn.com/files/d11f9d5c-6fd0-45b7-9c46-d6b4526e81d3/lowrance_elite_7_chirp_transducer_bracket.pdf
    • https://uploads.strikinglycdn.com/files/8e891075-9c34-4d36-981a-35f971632fde/ravopir.pdf
    • https://uploads.strikinglycdn.com/files/9840fffe-a766-4320-b553-00619a7556ed/xuzapideg.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f995.bin
111b532907b2181c7cd16df1487ed676e3d1660fe832cde248de4ab2a960fe8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 5448 bytes
font_01_sfnt_off00010c35.bin
bf2f36855033dd0762a0daae4c50a8c620779df85b67d819ecb40caa57b9b8c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 11908 bytes

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