Malicious PDF — malware analysis report

Static analysis result for SHA-256 b958caeb24eddc9d…

MALICIOUS

PDF

81.1 KB Created: 2021-03-19 07:50:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f8bbcdbbff4c7b67a878876de1d2b8f1 SHA-1: e62f9250932a5bd74f3c9b0e77e4eb15f063606f SHA-256: b958caeb24eddc9d932f97289754e97021916cc58b51f6765fa280bb5e10c4e4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/strik?utm_term=scale+factor+word+problems+kuta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465264/normal_603d218512ec0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_5fdbec83afde9.pdfIn PDF document text
    • http://gijaninapumobe.sportsontheweb.net/canadian_visa_application_form_philippines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473654/normal_5fcf585f3d75d.pdfIn PDF document text
    • http://dusikazo.mypressonline.com/pals_algorithm_2020_aha.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_6042f608ba321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_5fe6d01a20cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495413/normal_604fc295d3df2.pdfIn PDF document text
    • https://voxesisa.weebly.com/uploads/1/3/4/3/134349259/nevixupep-tedivit-dukuromolu.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/nemexixamizuboridizelosob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_5fe6ea3b09531.pdfIn PDF document text
    • http://kurametugugu.mygamesonline.org/51418888629.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370089/normal_60037d78992fa.pdfIn PDF document text
    • http://puveputado.sportsontheweb.net/vufitidaguvesub.pdfIn PDF document text
    • https://bujefodamefizup.weebly.com/uploads/1/3/1/0/131070612/3972224.pdfIn PDF document text
    • http://gejejasofubi.mywebcommunity.org/40765812252.pdfIn PDF document text
    • https://fekadoripegat.weebly.com/uploads/1/3/4/5/134592683/jugod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_6024cd4928925.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/astm_a106_chemical_composition.pdfIn PDF document text
    • http://kurixuj.sportsontheweb.net/43513442117.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
    • http://jotudokizer.onlinewebshop.net/dbpower_webcam_software.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/zudunezusanegovi.pdfIn PDF document text
    • http://zezofakarol.myartsonline.com/31885317504.pdfIn PDF document text
    • http://wilaroxu.atwebpages.com/adaptec_8805.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_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 5428 bytes
SHA-256: 00fe8fbe3788ebd5b10eaa4718aa6e06648ce566c928b2cc78a338ab8a48da25
font_01_sfnt_off00010142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 11436 bytes
SHA-256: 1cc8913831d8263c9a7ed26201cbbaf3d0ea650e564f2844088ade8305fd7cfd
font_02_sfnt_off00012849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12849 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c