Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b96adfc1878bfad…

MALICIOUS

PDF

76.6 KB Created: 2021-05-14 18:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 50375f6df801b4f3a8e5c062f0f469d8 SHA-1: f32babead7a8766080bcbaa18c088b49777ec20e SHA-256: 1b96adfc1878bfad8454dcbfb33ddb3611e97b0e98103dbafa2a91c5ce069c30
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=keystone+dehumidifier+parts PDF link annotation
    • http://it50save.info/domelukevipugowekeb1ricd.pdfIn PDF document text
    • http://grusha.space/9922434499szqjs.pdfIn PDF document text
    • http://loveantravel.xyz/xevipawazedafebufevikixegr9le2.pdfIn PDF document text
    • http://pro-gram.pro/brother_mfc-9970cdw_replace_belt_unit1s8kr.pdfIn PDF document text
    • https://zomuwobab.weebly.com/uploads/1/3/0/8/130873958/9f4b4e1.pdfIn PDF document text
    • https://feranipadolop.weebly.com/uploads/1/3/2/7/132740228/abaebadfa3738.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/16bd3527a7c473.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/gikowikiz_pikiximurinoxur_korete.pdfIn PDF document text
    • http://xenotobewaf.22web.org/dipuwivujigabisoxogobezak.pdfIn PDF document text
    • https://falesejus.weebly.com/uploads/1/3/1/4/131483218/7471170.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xikufozumif.epizy.com/1466363139.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_dc33fbb111464e479a74274d62db10b3.pdf?index=trueIn PDF document text
    • http://wutebanik.epizy.com/aldi_nord_angebote_prospekt.pdfIn PDF document text
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_87945166970b445fa3cf46e8dd87eed1.pdf?index=trueIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_e69779e64e244a40990348b15a07a952.pdf?index=trueIn PDF document text
    • https://0633afab-057d-4448-85e1-ac1a97571725.filesusr.com/ugd/66920c_e4d213bc3d8a410ca5ef1a048ba4bc11.pdf?index=trueIn PDF document text
    • http://kujodobiwug.rf.gd/post_office_bank_account_opening_form.pdfIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_92e566cc060d4d3fa2d4cf7b763df914.pdf?index=trueIn PDF document text
    • http://ludakijawiku.rf.gd/definition_du_cloud_computing.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_dd02a631904d4fd8a4349505ac478e0b.pdf?index=trueIn PDF document text
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_374660b1d76c4516937b28e2cd7ac6c5.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_dcca1c2d9cb54d85910bd4f924d1a9b2.pdf?index=trueIn 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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 5320 bytes
SHA-256: 5ad40ed0324dcee9eaf77e6d33878af88abbddbb4dc81991a78e6b5b278c42cd
font_01_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 10660 bytes
SHA-256: dacdd7dbcb334da75411b69115cb9d1ec73ca4a1cbe7389d672e22dbed1b1deb