Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff002f7e1526b614…

MALICIOUS

PDF

109.4 KB Created: 2021-04-03 18:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 66cc8f9fe42284b6788b85f5efc5c919 SHA-1: 68283bf085483eac1362b7660108a6264ed23ad5 SHA-256: ff002f7e1526b614b20ab5185b1efd680ecfc59b0fcdad4e8ce92f9a82a065d3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The file functions as a link farm, containing numerous external URLs, with one notable URL being 'https://maypoin.ru/strik?utm_term=how+many+cards+should+be+in+a+deck+including+jokers'. This suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=how+many+cards+should+be+in+a+deck+including+jokers PDF link annotation
    • https://dojobojijiwum.weebly.com/uploads/1/3/2/6/132681334/360469.pdfIn PDF document text
    • http://wonikugemozu.iblogger.org/biology_project_for_class_12_on_aids.pdfIn PDF document text
    • http://blaugrana.ru/18277284838330bs.pdfIn PDF document text
    • http://belldiscount.ru/cette_exprience_ma_permise_ou_permis62eo9.pdfIn PDF document text
    • http://bupetud.xyz/face_3d_model_appi5f89.pdfIn PDF document text
    • https://pagipakudux.weebly.com/uploads/1/3/5/3/135343553/842f5cc9b7.pdfIn PDF document text
    • http://zotarojeloxin.22web.org/the_final_empire_mistborn_book_1.pdfIn PDF document text
    • https://medijomozu.weebly.com/uploads/1/3/0/7/130775841/caf7775f74.pdfIn PDF document text
    • http://4d-5d.com/xujupolamokazin1kibb.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://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_964ec45122a54fc8ada8a8031a0d0a8f.pdf?index=trueIn PDF document text
    • http://jikokajogov.rf.gd/habanera_sheet_music_flute.pdfIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_063a915d060742068ea01bea54cb7969.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_9d5118158e7140d8993a1d4f13200a18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef4b532-f82f-4622-94be-4797574abccd/xavirokusufadijiteru.pdfIn PDF document text
    • http://varuxaze.epizy.com/drugs_society_and_criminal_justice_4th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a820201-e590-46db-a166-93e85264518f/descargar_evangelio_de_tomas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141bfe9f-e220-4f52-99e0-39a278349d6c/61144860353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1052b5e0-79af-493a-9cd5-d4043e91c51b/woodchuck_chipper_wc-12_parts.pdfIn PDF document text
    • https://c0e8410b-c394-4b36-8083-179878a46647.filesusr.com/ugd/d4b1dc_0bc1e65ac0c647459fa9691d31591b21.pdf?index=trueIn PDF document text
    • http://pujigiberaxu.epizy.com/basotho_culture_traditions_and_rituals.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_off000163ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163AD 5592 bytes
SHA-256: f1b90b1bc0b5a772ee6529330b8981df5176dda9cbd5cc228deddd9eeca46ad7
font_01_sfnt_off0001767a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1767A 10388 bytes
SHA-256: d8dbeeb5e2765bd1fd00b61287e66367a52f1f1426d88f2a54ddfe932bd75445
font_02_sfnt_off000199bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199BF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3