Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdbb14a1d34facc…

MALICIOUS

PDF

81.9 KB Created: 2021-03-15 20:26:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2e793b73b266e893a5f2e7baa377c926 SHA-1: a331989f8b12d0f01bd58f289d7412a2ba8fbfaf SHA-256: acdbb14a1d34facc1deea136decf323cb157b8ef48152423ad5fded94b67294d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics as a link farm, containing numerous external links to other PDFs hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to host phishing content. The embedded URLs and the structure suggest an attempt to distribute malicious or unwanted content through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://botokaw.ru/wix?keyword=how+to+unlock+lg+k20+plus PDF link annotation
    • http://belldiscount.ru/dell_u2515h_displayportwb910.pdfIn PDF document text
    • https://vemubofopelo.weebly.com/uploads/1/3/0/7/130776521/7224086.pdfIn PDF document text
    • https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/14e13d1.pdfIn PDF document text
    • https://metasabuvaro.weebly.com/uploads/1/3/2/6/132681671/a2977478eeaba.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/Oicplgd/43104878218.pdfIn PDF document text
    • http://oneitstore.info/xbox_369_status_code_03-57-00385op.pdfIn PDF document text
    • http://jugepawe.medianewsonline.com/what_labels_for_dymo_labelwriter_450.pdfIn PDF document text
    • https://cdn.sqhk.co/resesexiraf/Igiggjh/pancake_recipe_gluten_free_vegan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_68b2e226d46642dfa1cf9b62fcb4183f.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_cfc02ef21be54747bffe2f3333902dab.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_c186027672044e12945ffa3b4ddde984.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72d3ffc-1991-4bd4-b38a-adfb89d06cb8/kivefimakasixewegaduviziv.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_a9401f4088e7475eb6af6e1a828f373b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63fdb5fd-7e09-4252-ac3b-5734d678a8fe/12811911274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ce28dec-669e-4d48-8efa-0ffb5d93a050/jijewesisadopera.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/what_to_make_on_a_george_foreman_grill.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 4904 bytes
SHA-256: 95cebc5da07ee52f77f93fa74eb3611bb7ef1d05f18b4cca2d7c7983fc6d95eb
font_01_sfnt_off0001038a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038A 11644 bytes
SHA-256: 92fe696c54fc7508cbd8d2c5d4d40a4410b62ed754486ce202504f3f3d4f35ec
font_02_sfnt_off00012b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B22 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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